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[email protected] September 16th 07 10:51 AM

Should I learn celestial navigation before doing circumnavigation ?
 

I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

TIA

Hanz Schmidt September 16th 07 11:44 AM

Should I learn celestial navigation before doing circumnavigation?
 
I take 6. They fail all the time.....
And the stars failed to appear in the Pacific...

I wait until they make BETTER gps before I go...

Hanz


wrote:
I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

TIA




Akka September 16th 07 12:54 PM

Should I learn celestial navigation before doing circumnavigation ?
 
On Sep 16, 6:51 am, wrote:
I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

TIA


Sure, learn celestial navigation. Or group theory, or some other
arcane area of knowledge. Or bring some good books, like Moby Dick.
It gets pretty boring out there in the wide blue sea. But learn
celestial navigation as a backup for GPS? You've got to be kidding.
First, GPS works great in the middle of the ocean -- and everywhere
else, for that mattter. Second, definitely bring backup GPS units--
we have 3 aboard, in addition to our primary one. Put one in your
ditch bag and remember to inspect it regularly to see the batteries
are good. But don't worry about the satellite system failing -- the
US Government (and everybody else, from commercial airlines to
farmers) is too reliant on GPS to let it fail (or turn it off, which
is what the Europeans seem to fear).

It's celestial navigation that fails, mainly because it depends on
clear skies, which, in the middle of a storm, there ain't any of. One
reason the Carolina coast is littered with shipwrecks is that the Gulf
Stream is almost always covered with clouds, so those ancient mariners
went for days on dead-reckoning -- and with a 2-knot current with lots
of swirls and eddies, that's not a good thing. If they'd had GPS,
they would have been far less likely to run onto the sandbanks.

Good luck on your circumnavigation. See you out here.

Rob


Bill Kearney September 16th 07 03:46 PM

Should I learn celestial navigation before doing circumnavigation ?
 
If you have to ask this question then you're probably nowhere near prepared
to circumnavigate.

wrote in message
...

I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?



Paul Cassel September 16th 07 04:05 PM

Should I learn celestial navigation before doing circumnavigation?
 
wrote:
I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

\
You should get to an 80/20 knowledge of celestial. The basics are easy
and they'll see you to your destination well. Frex, you can get pretty
much anywhere, if not exactly on target, by doing only sun shots and
Polaris.

otnmbrd September 16th 07 04:58 PM

Should I learn celestial navigation before doing circumnavigation ?
 
wrote in :


How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

TIA


If there is such a book, I'd get it, plus the cheap sextant.
Even if all else fails you can use it to get a latitude which could help
get you to somewhere safe or play with it to reduce boredom.
Remember.....Celestial is an open ocean navigation system. Although it can
be highly accurate, it doesn't really have to be all that precise.... it
mainly needs to get you to a point where you can use other methods
(visual/soundings) to get the precise info you need to make a safe
landfall.

Capt. JG September 16th 07 06:07 PM

Should I learn celestial navigation before doing circumnavigation ?
 
wrote in message
...

I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

TIA



Learning something new (or in this case old) is always a good idea. That
said, the GPS sat system works just fine. The biggest issue is that your
batteries die. Bring spares of batteries and GPSs. Your friend has a point
on the top of his head.

--
"j" ganz @@
www.sailnow.com




Wilbur Hubbard September 16th 07 06:23 PM

Should I learn celestial navigation before doing circumnavigation ?
 

wrote in message
...

I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

TIA


Don't worry about it. Just get a plastic sextant, an instruction book
and some HO 249 tables. Any moron can learn celestial on the fly. I
learned it on the fly in two days, enough to make a cocked hat about a
mile on a side. Still, for a man who loves precision, I prefer GPS.
Consider getting at least one GPS portable that uses the Russian
constellation in case the US constellation gets shot down by the Chinese
one of these days. Portables are pretty immune from going to hell
provided they are kept in a water proof case like a Pelican case and
then stored inside a metal case. Even a lighting strike to the mother
ship rarely harms them. If you're paranoid, store three or four
portables in different places around the ship. Get plenty of batteries
or have a means to charge rechargeable batteries independent of the
motor. (solar)

Wilbur Hubbard



roger[_2_] September 16th 07 09:23 PM

Should I learn celestial navigation before doing circumnavigation ?
 
On Sep 16, 1:23 pm, "Wilbur Hubbard"
wrote:
wrote in message

...



I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.


Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?


How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?


TIA


Don't worry about it. Just get a plastic sextant, an instruction book
and some HO 249 tables. Any moron can learn celestial on the fly. I
learned it on the fly in two days, enough to make a cocked hat about a
mile on a side. Still, for a man who loves precision, I prefer GPS.
Consider getting at least one GPS portable that uses the Russian
constellation in case the US constellation gets shot down by the Chinese
one of these days. Portables are pretty immune from going to hell
provided they are kept in a water proof case like a Pelican case and
then stored inside a metal case. Even a lighting strike to the mother
ship rarely harms them. If you're paranoid, store three or four
portables in different places around the ship. Get plenty of batteries
or have a means to charge rechargeable batteries independent of the
motor. (solar)

Wilbur Hubbar Electronics fail. It's one of the constants on a boat in a salt water environment. Celestial navigation is not for morons, GPS receivers are. Intelligent blue water sailors learn celestial navigation. It is the back up. It can save your life. Don't think of it as a chore, it is part of the fun of blue water sailing if you let it be.



roger[_2_] September 16th 07 09:30 PM

Should I learn celestial navigation before doing circumnavigation ?
 
On Sep 16, 5:51 am, wrote:
I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?

TIA


I would learn celestial navigation if I were you. There is safety in
redundancy as you obviously know by bringing 3 gps sysems with you.
If you learn celestial you could reduce that to just two perhaps. It
seems that most experienced blue water sailors know how to use a
sextant. There is some satisfaction in navigating by the stars for
some of us instead of relying on electronics. Its part of the charm
of blue water sailing for me.


roger[_2_] September 16th 07 09:36 PM

Should I learn celestial navigation before doing circumnavigation ?
 
It seems like every joe blow average is cruising out there. Its like
Mount Everest, everyone is climbing it these days or trying to,
wearing designer climbing clothings listening to their ipods while
trying to reach the summit or dying in the process.

Why not rise above the crowd and learn celestial navigation. It is not
an obsolete skill and people respect those that know how to do it even
if they won't admit it.


Larry September 16th 07 09:56 PM

Should I learn celestial navigation before doing circumnavigation ?
 
wrote in :

because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.


Nonsense, pure nonsense. GPS runs on POLAR ORBIT, low earth orbit
satellites....not geostationary like XM with a certain area footprint.
The footprint of one satellite is a mere 150 miles under it...but there
are so MANY satellites in the huge constellation that there are always 8-
12 above the horizon ANYWHERE ON THE GLOBE, including the middle of any
ocean. The birds pass overhead and another bird comes up over the
horizon to replace it.

Celestial Navigation, while quite romantic and "salty", are no longer
necessary for worldwide navigation.

Larry
--
Search youtube for "Depleted Uranium"
The ultimate dirty bomb......

Wilbur Hubbard September 16th 07 10:28 PM

Should I learn celestial navigation before doing circumnavigation ?
 

"roger" wrote in message
ups.com...
On Sep 16, 1:23 pm, "Wilbur Hubbard"
wrote:
wrote in message

...



I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.


Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?


How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?


TIA


Don't worry about it. Just get a plastic sextant, an instruction book
and some HO 249 tables. Any moron can learn celestial on the fly. I
learned it on the fly in two days, enough to make a cocked hat about
a
mile on a side. Still, for a man who loves precision, I prefer GPS.
Consider getting at least one GPS portable that uses the Russian
constellation in case the US constellation gets shot down by the
Chinese
one of these days. Portables are pretty immune from going to hell
provided they are kept in a water proof case like a Pelican case and
then stored inside a metal case. Even a lighting strike to the mother
ship rarely harms them. If you're paranoid, store three or four
portables in different places around the ship. Get plenty of
batteries
or have a means to charge rechargeable batteries independent of the
motor. (solar)

Wilbur Hubbar
Electronics fail. It's one of the constants on a boat in a salt water
environment. Celestial navigation is not for morons, GPS receivers
are. Intelligent blue water sailors learn celestial navigation. It
is the back up. It can save your life. Don't think of it as a chore,
it is part of the fun of blue water sailing if you let it be.



If you carry multiple GPS backups the chance of all of them going bad on
a circumnavigation is less than the chances of your dropping your
sextant overboard.

I didn't say celestial navigation was for morons. I said even a moron
could learn it. It isn't that hard. Even that 14-year-old girl Tanya
Aebi of "Maiden Voyage" fame who circumnavigated learned it as she went.
And that was before they even had GPS. BTW, I heard she's in the
process of going round again. This time with her 14-year-old son and a
bigger boat. Time flies. . .

Wilbur Hubbard


otnmbrd September 16th 07 11:06 PM

Should I learn celestial navigation before doing circumnavigation ?
 
Larry wrote in news:Xns99ADAD78CF807noonehomecom@
208.49.80.253:



Celestial Navigation, while quite romantic and "salty", are no longer
necessary for worldwide navigation.

Larry


No longer necessary, true, but for a long distance sailor the ability to
use it can/could come in handy for many reasons.
Hell, we could say that the Mark 1 eyeball or soundings are no longer
necessary, but we still use them and find good reasons to do so.

thunder September 16th 07 11:08 PM

Should I learn celestial navigation before doingcircumnavigation ?
 
On Sun, 16 Sep 2007 17:28:42 -0400, Wilbur Hubbard wrote:



Even that 14-year-old girl Tanya Aebi


Assuming that's not a typo, Tania was a little older than that. She started off when she was 18.

Red September 17th 07 03:00 AM

Should I learn celestial navigation before doing circumnavigation?
 
brucepaige wrote:
How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.

I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails or a chip log mounted on the stern
pulpit in case your electronic speed log fails.


I see a number of arguments in this discussion. Fist, GPS recievers,
like all electronics are prone to occasional errors and failures. There
are numerous stories that abound in cruiser's logs on the net of GPS
readings that reported the boat to be a half mile or so inland, or in
the middle of a channel but the boat hits a charted reef, etc. There
are perhaps hundreds or maybe thousands of places around the world that
have innacurate GPS coordinates or innacurate maps used for the GPS
data. The Garmin chartplotter on the boat I usually sail on shows us on
land when we are in the middle of the channel in home port (and yes, the
settings are correct for the charts). So other forms of measurement are
always appropriate to know. And like it or not, the Pentagon did shut
down the satellite system for one day, and can do that anytime again,
not to mention the likelyhood of the system having problems as the
satellites age. And since I both sail and work on boats I can tell you
that both the depth sounders and speed logs do fail with amazing regularity.
Red

[email protected] September 17th 07 02:04 PM

Should I learn celestial navigation before doing circumnavigation ?
 
On Sun, 16 Sep 2007 22:06:00 -0000, otnmbrd
wrote:

Larry wrote in news:Xns99ADAD78CF807noonehomecom@
208.49.80.253:



Celestial Navigation, while quite romantic and "salty", are no longer
necessary for worldwide navigation.

Larry


No longer necessary, true, but for a long distance sailor the ability to
use it can/could come in handy for many reasons.
Hell, we could say that the Mark 1 eyeball or soundings are no longer
necessary, but we still use them and find good reasons to do so.



You know it's kind of funny. Everyone talks about using an archaic
method of determining position and never mention using either a lead
line to determine depth or a chip log to determine speed.

How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.

I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails or a chip log mounted on the stern
pulpit in case your electronic speed log fails.

I am not saying that one shouldn't learn celestial navigation or not
carry extra life jackets but it is no longer a necessary skill.




Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Jeff September 17th 07 03:22 PM

Should I learn celestial navigation before doing circumnavigation?
 
wrote:

You know it's kind of funny. Everyone talks about using an archaic
method of determining position and never mention using either a lead
line to determine depth or a chip log to determine speed.


I carry a lead line, and use it on occasion, usually when moored in very
tight quarters. I also have a knot log, but that's a display item at
home. However, for many years I estimated speed by tossing a piece of
paper overboard and timing its travel alongside. In a few minutes
anyone can make a "chip log table" calibrated for their boat.

The difference is that anyone can tie a wrench on a rope and they have a
lead line. No special equipment or training is needed, just a bit of
common sense.


How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.


A sextant can be helpful for coastal navigation, but celestial clearly
has its limitations. And I will admit that my new chartplotter allowed
me to go places in the Maine fog this summer that I never would have in
the past.

The more interesting question would be how many boats practice basic
plotting such as running fixes? How many turn off their GPS for a day
and run down the coast with bearings? How many use the depth sounder
for part of their fix? These are the skills that should be learned.



I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails


I've mentioned it several times. But its so obvious, I didn't think it
needed daily comment.

or a chip log mounted on the stern
pulpit in case your electronic speed log fails.


My speed log is so unreliable I never expect it to run!


I am not saying that one shouldn't learn celestial navigation or not
carry extra life jackets but it is no longer a necessary skill.


Its surprising how many of the old timers actually didn't know
celestial. Before radio an accurate clock was needed for longitude, and
that was beyond the budget of a lot of ships. For all the talk of the
lunar methods, very few mariners actually used it.

FWIW, I have five sextants, but have not carried one on board in six
years. If I did a long ocean crossing, however, I would carry one just
for the practice.


Scotty September 17th 07 03:47 PM

Should I learn celestial navigation before doing circumnavigation ?
 

"jeff" wrote in message
...
wrote:


I carry a lead line, and use it on occasion, usually when

moored in very
tight quarters.


when anchoring in shallow water, I use my boat hook to check
the bottom.

SBV



Gordon September 17th 07 04:34 PM

Should I learn celestial navigation before doing circumnavigation?
 
wrote:
On Sun, 16 Sep 2007 22:06:00 -0000, otnmbrd
wrote:

Larry wrote in news:Xns99ADAD78CF807noonehomecom@
208.49.80.253:


Celestial Navigation, while quite romantic and "salty", are no longer
necessary for worldwide navigation.

Larry

No longer necessary, true, but for a long distance sailor the ability to
use it can/could come in handy for many reasons.
Hell, we could say that the Mark 1 eyeball or soundings are no longer
necessary, but we still use them and find good reasons to do so.



You know it's kind of funny. Everyone talks about using an archaic
method of determining position and never mention using either a lead
line to determine depth or a chip log to determine speed.

How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.

I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails or a chip log mounted on the stern
pulpit in case your electronic speed log fails.

I am not saying that one shouldn't learn celestial navigation or not
carry extra life jackets but it is no longer a necessary skill.




Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Does anyone doubt that Columbus or Slocum would have passed on using a
GPS had it been available?
G

KLC Lewis September 17th 07 04:37 PM

Should I learn celestial navigation before doing circumnavigation ?
 

"Gordon" wrote in message
...
Does anyone doubt that Columbus or Slocum would have passed on using a
GPS had it been available?
G


Yes. ;-)



Don White September 17th 07 05:01 PM

Should I learn celestial navigation before doing circumnavigation ?
 

"Scotty" wrote in message
. ..

"jeff" wrote in message
...
wrote:


I carry a lead line, and use it on occasion, usually when

moored in very
tight quarters.


when anchoring in shallow water, I use my boat hook to check
the bottom.

SBV


Either you carry a very long boat hook... or your definition of shallow is
different from most sailors.



Capt. JG September 17th 07 05:24 PM

Should I learn celestial navigation before doing circumnavigation ?
 
wrote in message
...
On Sun, 16 Sep 2007 22:06:00 -0000, otnmbrd
wrote:

Larry wrote in news:Xns99ADAD78CF807noonehomecom@
208.49.80.253:



Celestial Navigation, while quite romantic and "salty", are no longer
necessary for worldwide navigation.

Larry


No longer necessary, true, but for a long distance sailor the ability to
use it can/could come in handy for many reasons.
Hell, we could say that the Mark 1 eyeball or soundings are no longer
necessary, but we still use them and find good reasons to do so.



You know it's kind of funny. Everyone talks about using an archaic
method of determining position and never mention using either a lead
line to determine depth or a chip log to determine speed.

How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.

I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails or a chip log mounted on the stern
pulpit in case your electronic speed log fails.

I am not saying that one shouldn't learn celestial navigation or not
carry extra life jackets but it is no longer a necessary skill.




Bruce in Bangkok
(brucepaigeATgmailDOTcom)



Actually, the lead line is something we talk about during some of our
classes...


--
"j" ganz @@
www.sailnow.com




otnmbrd September 17th 07 05:29 PM

Should I learn celestial navigation before doing circumnavigation ?
 
wrote in news:futse3pgo9nvn157klj3rkodjqh8gv0777@
4ax.com:


You know it's kind of funny. Everyone talks about using an archaic
method of determining position and never mention using either a lead
line to determine depth or a chip log to determine speed.

How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.

I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails or a chip log mounted on the stern
pulpit in case your electronic speed log fails.

I am not saying that one shouldn't learn celestial navigation or not
carry extra life jackets but it is no longer a necessary skill.




Bruce in Bangkok
(brucepaigeATgmailDOTcom)



Taking this back to the original post...... the poster was asking about
offshore navigation (my assumption) and the benefits of learning and having
the ability to use celestial.
A cheap sextant and a few books is an easy way to add a layer of possible
solutions should Mr. Murphy rear his ugly head.

BTW.... watching a show on offroading, the host suggested using one of
those vacumn packing/sealing machines with the plastic bags to seal parts
against dirt and water/weather..... should think this would have a great
potential on boats also... especially the offshore cruiser.


LOL....I know..... how'd I jump this far on subject matter?


Jeff September 17th 07 06:55 PM

Should I learn celestial navigation before doing circumnavigation?
 
Don White wrote:

I carry a lead line, and use it on occasion, usually when

moored in very
tight quarters.

when anchoring in shallow water, I use my boat hook to check
the bottom.

SBV


Either you carry a very long boat hook... or your definition of shallow is
different from most sailors.


I used my boat hook several times summer - since my boat only draws 3
feet and the hook extends to over 8 feet, I don't see where the problem
would be. There have been times in the Keys when I stood on the bottom
to see if we'd have enough at low.

Lew Hodgett September 17th 07 07:25 PM

Should I learn celestial navigation before doing circumnavigation ?
 

wrote

I was just told by a friend that I should learn celestial
navigation before sailing around the world because
GPS devices don't work that well in the middle of the
ocean and can malfunction if they get wet, etc.

Does my friend have a point even if I intend to bring
3 independent GPS systems with me ?

How about if I just get a cheap sextant and the book
"Celestial Navigation When Your GPS Fails" and
bring them with me ?


The information supplied by your friend perhaps could use some updating.

The basic GPS system is very reliable and is used worldwide by many,
including the aviation industry.

Small, battery operated units, likely to be found on small boats are more
likely to fail than those on aircraft; however, having multiple back up
units on board addresses this issue.

Being able to use a low cost sextant as the last opportunity navigation
device, certainly has it's advantages, and basic celestial navigation is not
difficult to learn.

SFWIW, I have a new, still in the box, Davis, Mark15 sextant, complete with
artificial horizon that I'm about to put on Craig's list.

If you are interested, contact me off list.

Lew




Marc Auslander September 17th 07 10:38 PM

Should I learn celestial navigation before doing circumnavigation ?
 
If you are going to use a sextant, you need a reliable clock.

The most reliable, accurate clock available today is a GPS receiver.
So pack a spare GPS receiver along with the sextant. As an added
advantage, you can always cheat and check your fix against what your
"clock" tells you :-)
--

[email protected] September 18th 07 01:06 AM

Should I learn celestial navigation before doing circumnavigation ?
 
On Mon, 17 Sep 2007 13:55:25 -0400, jeff wrote:

Don White wrote:

I carry a lead line, and use it on occasion, usually when
moored in very
tight quarters.
when anchoring in shallow water, I use my boat hook to check
the bottom.

SBV


Either you carry a very long boat hook... or your definition of shallow is
different from most sailors.


I used my boat hook several times summer - since my boat only draws 3
feet and the hook extends to over 8 feet, I don't see where the problem
would be. There have been times in the Keys when I stood on the bottom
to see if we'd have enough at low.



Well, if you have six foot tides you might have a problem :-)


Bruce in Bangkok
(brucepaigeATgmailDOTcom)

[email protected] September 18th 07 01:17 AM

Should I learn celestial navigation before doing circumnavigation ?
 
On Mon, 17 Sep 2007 16:29:01 -0000, otnmbrd
wrote:

wrote in news:futse3pgo9nvn157klj3rkodjqh8gv0777@
4ax.com:


You know it's kind of funny. Everyone talks about using an archaic
method of determining position and never mention using either a lead
line to determine depth or a chip log to determine speed.

How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.

I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails or a chip log mounted on the stern
pulpit in case your electronic speed log fails.

I am not saying that one shouldn't learn celestial navigation or not
carry extra life jackets but it is no longer a necessary skill.




Bruce in Bangkok
(brucepaigeATgmailDOTcom)



Taking this back to the original post...... the poster was asking about
offshore navigation (my assumption) and the benefits of learning and having
the ability to use celestial.
A cheap sextant and a few books is an easy way to add a layer of possible
solutions should Mr. Murphy rear his ugly head.

BTW.... watching a show on offroading, the host suggested using one of
those vacumn packing/sealing machines with the plastic bags to seal parts
against dirt and water/weather..... should think this would have a great
potential on boats also... especially the offshore cruiser.


LOL....I know..... how'd I jump this far on subject matter?



Vacuum packing. Quite a number of people I meet use this system
both for food and for things that they don;t want to deteriorate in
the damp atmosphere on a boat. Apparently works great.

The original poster was asking if he HAD to learn celestial before
starting off on his world tour and frankly (I'm about half way around
on most people's trip) I have never talked to anyone who actually used
a sextant to navigate. I have talked to people who had one aboard but
if you ask them whether they actually use it they sort of grin and
admit that "no, they don't".






Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Jeff September 18th 07 01:40 AM

Should I learn celestial navigation before doing circumnavigation?
 
wrote:

I used my boat hook several times summer - since my boat only draws 3
feet and the hook extends to over 8 feet, I don't see where the problem
would be. There have been times in the Keys when I stood on the bottom
to see if we'd have enough at low.



Well, if you have six foot tides you might have a problem :-)


Bruce in Bangkok
(brucepaigeATgmailDOTcom)


Here's the spot where I used the boat hook (Misery Island, Salem Bay, MA):

http://www.sv-loki.com/IMGP1025.jpg

The tides there are about 10 feet. The spot where we're at in the
picture has about 4 feet under the keel at low, but the previous night
we were on the red mooring on the far right and early in the morning I
determined that we were headed for a deficit of an inch or two (because
of an extreme low), so we moved over.

In the Keys, of course, the tides are generally two feet or less.

Jere Lull September 18th 07 01:57 AM

Should I learn celestial navigation before doing circumnavigation ?
 
On 2007-09-16 16:36:13 -0400, roger said:

Why not rise above the crowd and learn celestial navigation. It is not
an obsolete skill and people respect those that know how to do it even
if they won't admit it.


Didn't Annapolis stop requiring celestial navigation a year or two back?

--
Jere Lull
Tanzer 28 #4 out of Tolchester, MD
Xan's new pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI pages: http://homepage.mac.com/jerelull/BVI/


otnmbrd September 18th 07 02:01 AM

Should I learn celestial navigation before doing circumnavigation ?
 
wrote in
:



The original poster was asking if he HAD to learn celestial before
starting off on his world tour and frankly (I'm about half way around
on most people's trip) I have never talked to anyone who actually used
a sextant to navigate. I have talked to people who had one aboard but
if you ask them whether they actually use it they sort of grin and
admit that "no, they don't".

Bruce in Bangkok
(brucepaigeATgmailDOTcom)


G The point to be made is not necessarily whether you use it (except
as an exercise or to have some fun, why bother) the point is can it be
of value should Mr. Murphy blah, blah, blah.
His statement regarding buying a cheap sextant and the particular book
was a valid idea which would give him that one more level of
protection/ability, should......

BTW you don't need an "accurate clock" to use a sextant, but speaking of
"time" most any modern (or old, for that matter)watch keeps accurate
enough time that it could be used, especially if you checked it prior to
"doomsday"
Jeff...accurate clocks were being used on many ships, long before
radio....radio just made it easier to monitor the rate

Jeff September 18th 07 02:17 AM

Should I learn celestial navigation before doing circumnavigation?
 
otnmbrd wrote:


BTW you don't need an "accurate clock" to use a sextant, but speaking of
"time" most any modern (or old, for that matter)watch keeps accurate
enough time that it could be used, especially if you checked it prior to
"doomsday"


My father-in-law was torpedoed at the end of WWII and spent 18 days in a
liferaft. They were able to track their longitude quite well because as
the radio officer he knew the error of his watch.

http://www.sv-loki.com/Davis/Clippings/clippings.html
more stuff at
http://www.sv-loki.com/Davis/davis.html

Jeff...accurate clocks were being used on many ships, long before
radio....radio just made it easier to monitor the rate


Agreed that many ships had clocks, especially larger ships and warships.
But a huge number did not, and I would guess that a large majority of
coastal shipping and fishing boats only rarely (if ever) had a celestial
fix.


otnmbrd September 18th 07 02:28 AM

Should I learn celestial navigation before doing circumnavigation ?
 
Jere Lull wrote in news:2007091720575416807-
jerelull@maccom:

On 2007-09-16 16:36:13 -0400, roger said:

Why not rise above the crowd and learn celestial navigation. It is not
an obsolete skill and people respect those that know how to do it even
if they won't admit it.


Didn't Annapolis stop requiring celestial navigation a year or two back?


EG Annapolis is Navy..... not professional mariners.....nuff said

otnmbrd September 18th 07 02:39 AM

Should I learn celestial navigation before doing circumnavigation ?
 
jeff wrote in
:

otnmbrd wrote:


BTW you don't need an "accurate clock" to use a sextant, but speaking
of "time" most any modern (or old, for that matter)watch keeps
accurate enough time that it could be used, especially if you checked
it prior to "doomsday"


My father-in-law was torpedoed at the end of WWII and spent 18 days in
a liferaft. They were able to track their longitude quite well
because as the radio officer he knew the error of his watch.

http://www.sv-loki.com/Davis/Clippings/clippings.html
more stuff at
http://www.sv-loki.com/Davis/davis.html

Jeff...accurate clocks were being used on many ships, long before
radio....radio just made it easier to monitor the rate


Agreed that many ships had clocks, especially larger ships and
warships.
But a huge number did not, and I would guess that a large majority
of
coastal shipping and fishing boats only rarely (if ever) had a
celestial fix.



BG Been a while since we had a discussion...... At any rate...... many
coastal vessels and fishing vessels would not need to use
celestial....here, you would need a historian to give you an accurate
reading as to the how and who did what (I'm not him/her)
BG Going to be on the Cape from 26th to 1st....if you get to Hyannis,
look me up (try the Black Cat)

Larry September 18th 07 05:31 AM

Should I learn celestial navigation before doing circumnavigation ?
 
jeff wrote in news:Y-
:

ts surprising how many of the old timers actually didn't know
celestial.


Wouldn't the time be better spent learning how to USE that new navigation
program running on the laptop than screwing around with your astrolabe?

Most sailors I know have no idea how to use the nav program running on
their boat....beyond using it for a chart that plots itself and the
simplest of map programs.

Sure is neat to see all those AIS targets now placed on the chart plotters
on Lionheart...(c; That electronics guy has everything working great, now!

Larry
--
Search youtube for "Depleted Uranium"
The ultimate dirty bomb......

[email protected] September 18th 07 10:39 AM

Should I learn celestial navigation before doing circumnavigation ?
 
On Sun, 16 Sep 2007 22:00:26 -0400, Red wrote:

brucepaige wrote:
How come all the advocates of a relative low tech method of
determining a position never mention that the system is unusable for
navigation in tight spaces, narrow channels, etc. and dead reckoning
or taking sights or measuring depth will be necessary.

I never hear anyone recommend having a lead line on board in case your
electronic depth sounder fails or a chip log mounted on the stern
pulpit in case your electronic speed log fails.


I see a number of arguments in this discussion. Fist, GPS recievers,
like all electronics are prone to occasional errors and failures. There
are numerous stories that abound in cruiser's logs on the net of GPS
readings that reported the boat to be a half mile or so inland, or in
the middle of a channel but the boat hits a charted reef, etc. There
are perhaps hundreds or maybe thousands of places around the world that
have innacurate GPS coordinates or innacurate maps used for the GPS
data. The Garmin chartplotter on the boat I usually sail on shows us on
land when we are in the middle of the channel in home port (and yes, the
settings are correct for the charts). So other forms of measurement are
always appropriate to know. And like it or not, the Pentagon did shut
down the satellite system for one day, and can do that anytime again,
not to mention the likelyhood of the system having problems as the
satellites age. And since I both sail and work on boats I can tell you
that both the depth sounders and speed logs do fail with amazing regularity.
Red


Yes, electronic devices fail and sextants get dropped knocking the
mirrors out of alignment.

Yes some GPS positions show you as on dry land when you look at a
chart and a "cocked hat" sextant fix a mile on a side is doing really
good, i.e., you are somewhere inside a half a square mile area.

You can't use celestial navigation to stay in the middle of a narrow
channel because you can't take shots and work the calculations fast
enough, even with a calculator.

The original poster asked " Should I learn celestial navigation before
doing circumnavigation ?" and to me the answer is a resounding NO!

If you want to learn an archaic skill such as sword fighting, shooting
the long bow, or shooting stars then more power to you but the ability
to do celestial navigation is not a necessary skill in today's world.

In closing let me say that I learned celestial navigation from a Lt.
Colonel, the Lead Navigator in a SAC B-52 squadron and used to carry a
sextant, H.O. tables and expensive watch and all that, but that was
fifty years ago. Things have changed.



Bruce in Bangkok
(brucepaigeATgmailDOTcom)

[email protected] September 18th 07 10:50 AM

Should I learn celestial navigation before doing circumnavigation ?
 
On Tue, 18 Sep 2007 01:28:53 -0000, otnmbrd
wrote:

Jere Lull wrote in news:2007091720575416807-
jerelull@maccom:

On 2007-09-16 16:36:13 -0400, roger said:

Why not rise above the crowd and learn celestial navigation. It is not
an obsolete skill and people respect those that know how to do it even
if they won't admit it.


Didn't Annapolis stop requiring celestial navigation a year or two back?


EG Annapolis is Navy..... not professional mariners.....nuff said



I have a good friend who is both a university trained Marine Engineer
and a licensed ships officer (2nd engineer). His primary work is being
a project manager on VLCC, modifications and repairs but between
projects sometimes sails as second engineer on VLCC's or container
ships.

During the last discussion of sextants I happened to run into him in
Singapore and asked him if modern shipping still used celestial
navigation. He told me that on some ships junior officers still took
noon sights but only because the Captain felt it was a useful skill
for a ship's officer. Other ships didn't have a sextant aboard.


Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Larry September 18th 07 03:24 PM

Should I learn celestial navigation before doing circumnavigation ?
 
wrote in news:d26ve3lofos8h97d29tseulhljlqskidna@
4ax.com:

Things have changed.


I should say....click where you want to go and let The Cap'n figure out
how to steer it in the laptop...(c;

Ours is on wifi....Just plug into 12V anywhere on the boat.

By the way, I do have a very expensive Japanese sextant in a beautiful
storage box made of some fine wood, the HO tables, navigation books, etc.
I learned from a master chief quartermaster, USN, on the open bridge of
the USS Everglades (AD-24) from a man who'd been doing it for 35 years.
With the Navy's nice sextant, we could match the LORAN fix within about
400 yards, given enough time and great weather.

Sure wish we'd had GPS in the 60's....

Larry
--

otnmbrd September 18th 07 04:19 PM

Should I learn celestial navigation before doing circumnavigation ?
 



During the last discussion of sextants I happened to run into him in
Singapore and asked him if modern shipping still used celestial
navigation. He told me that on some ships junior officers still took
noon sights but only because the Captain felt it was a useful skill
for a ship's officer. Other ships didn't have a sextant aboard.


Bruce in Bangkok
(brucepaigeATgmailDOTcom)


The days of watching some relieving Mate come aboard with his sextant as
part of his gear, are over. However, a ship sextant and the pubs to use it
are still standard gear onboard.
Once again, it is not necessary to learn celestial for someone doing
offshore cruising, BUT, it is STILL a good safety practice to have the gear
(no matter how cheap) and the minimal pubs to make use of it in an
emergency


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