there.

So, how did you calculate the effects of tide on your course to steer?

No calculations were needed. The current was on our nose. I chose to maintain
course with reduced VMG. For most the trip the wind did all it could to aid us
against the current.

RB

"Bobsprit" wrote in message

So, how did you calculate the effects of tide on your course to steer?

No calculations were needed. The current was on our nose. I chose to
maintain
course with reduced VMG.

Was this what you expected before setting off? (Tidal direction being 180
deg to your course, I mean.)

Did your logged speed remain fairly constant (aside from variations due to
changes in wind speed)?


--
Wally
I demand rigidly-defined areas of uncertainty!
www.art-gallery.myby.co.uk

Was this what you expected before setting off? (Tidal direction being 180
deg to your course, I mean.)

Did your logged speed remain fairly constant (aside from variations due to
changes in wind speed)?

Yup. Eldridge showed those currents, but I really expected to make a better
VMG, for no valid reason!
Speed over ground averaged 3.5 to 5.5knots. Knotmeter gave 6.5 to 8 knots. Our
average was probably below 5 knots after the third hour, but picked up again at
the last few hours.

RB

Excellent... you determined both set & drift as well?? That's not easy on a
current that appears to average at over 2 knots at times. Was the seafloor
topography fairly constant or did you compensate for the shallows and surges
they would present?

Could you provide the calcs for that... for the enlightenment of those
unfamiliar of course. ;-)

CM

"Bobsprit" wrote in message
...
| Was this what you expected before setting off? (Tidal direction being 180
| deg to your course, I mean.)
|
| Did your logged speed remain fairly constant (aside from variations due to
| changes in wind speed)?
|
| Yup. Eldridge showed those currents, but I really expected to make a
better
| VMG, for no valid reason!
| Speed over ground averaged 3.5 to 5.5knots. Knotmeter gave 6.5 to 8 knots.
Our
| average was probably below 5 knots after the third hour, but picked up
again at
| the last few hours.
|
| RB

Was the seafloor
topography fairly constant or did you compensate for the shallows and surges
they would present?

Wow. Desperate, ay? I did not observe the sea floor topography. Nor does anyone
I've met sailing the area.

RB

"Bobsprit" wrote in message
...
| Was the seafloor
| topography fairly constant or did you compensate for the shallows and
surges
| they would present?
|
| Wow. Desperate, ay? I did not observe the sea floor topography. Nor does
anyone
| I've met sailing the area.

Odd... it should be displayed on your chart and confirmed on your
sounder.... maybe it was too technical a question for you?

CM

Excellent... you determined both set & drift as well?? That's not easy on a
current that appears to average at over 2 knots at times.

Observing the track set on the GPS, sailing on a reach, with 1.5-2.5 knots of
current against, we only deviated from our track by about a mile. Once 20 miles
of the return trip were under the keel we could see the Manhattan skyline and
it became a line-of-site sail, though i maintained a specific (245 If I
remember right) SW compass heading anyway.

RB

"Bobsprit" wrote in message
...
| Excellent... you determined both set & drift as well?? That's not easy on
a
| current that appears to average at over 2 knots at times.
|
| Observing the track set on the GPS, sailing on a reach, with 1.5-2.5 knots
of
| current against, we only deviated from our track by about a mile. Once 20
miles
| of the return trip were under the keel we could see the Manhattan skyline
and
| it became a line-of-site sail, though i maintained a specific (245 If I
| remember right) SW compass heading anyway.

So I take it that you only used the GPS on occasion to verify your chart
plot and rightly considered a cross track [drift] error of one mile in 20 as
not worth concern as long as you knew where you would be on arrival to
corrected waypoint?

Excellent Bob... this is what I was hoping to gently persuade you to discuss
in the first place.

I often find myself too lazy to tweak and set trim to compensate for this as
well... especially when I have dinner in the oven and the heel is perfect
for cooking while underway. Good Show!

CM

So I take it that you only used the GPS on occasion to verify your chart
plot and rightly considered a cross track [drift] error of one mile in 20 as
not worth concern as long as you knew where you would be on arrival to
corrected waypoint?

Actually, some dumb behavior on my part. I failed to put fresh batteries aboard
for the the GPS and left the new power cable home. I was "spot" using the GPS
by Sunday and I even failed to buy batteries at port jeff!
Yes, the small drift was just not a factor over such a short distance. The most
I know about the Sound's bottom is that taking more "near coastal" tracks can
ease current woes. On the other hand, I was expecting wind direction changes
and I wanted more course options afforded by being in the center of the sound.

RB

A cross track error of 1 mile can lead to unexpected rocks -unless you
know from the chart all; is well. Of course you are also sailing further...

Cheers MC

Capt. Mooron wrote:

"Bobsprit" wrote in message
...
| Excellent... you determined both set & drift as well?? That's not easy on
a
| current that appears to average at over 2 knots at times.
|
| Observing the track set on the GPS, sailing on a reach, with 1.5-2.5 knots
of
| current against, we only deviated from our track by about a mile. Once 20
miles
| of the return trip were under the keel we could see the Manhattan skyline
and
| it became a line-of-site sail, though i maintained a specific (245 If I
| remember right) SW compass heading anyway.

So I take it that you only used the GPS on occasion to verify your chart
plot and rightly considered a cross track [drift] error of one mile in 20 as
not worth concern as long as you knew where you would be on arrival to
corrected waypoint?

Excellent Bob... this is what I was hoping to gently persuade you to discuss
in the first place.

I often find myself too lazy to tweak and set trim to compensate for this as
well... especially when I have dinner in the oven and the heel is perfect
for cooking while underway. Good Show!

CM