Peter S/Y Anicula wrote:
I just found out that there are english versions of the pages I linked
to:

http://www.frv.dk/en/nyheder/nyheder.htm#54
http://www.frv.dk/en/ifm/navigation/gps.htm

Thanks for the info & the links, Peter.

I'm not sure I understand this- you can tell your GPS to ignore or put
less priority on certain satellites? That would be a very cool feature.

It's amazing how many people have no idea how to navigate without GPS...
a lot of people who use to know are so out of practice that they are
functionally lost without it.

On our last trip, a relatively short river jaunt of a few days (rudely
interrupted by H. Bonnie and H. Charley), we were rather sloppy for the
first day and had a lot of household junk piled on the chart table. When
I realized I couldn't lay out a course, I threw it all on the floor (I
was in a hurry, I cleaned it up myself later). We had a "serious" talk
about the unwisdom of sloppy practices... the arriving hurricanes later
in the week emphasized this!

Fresh Breezes- Doug King

Doug Wrote:

I'm not sure I understand this- you can tell your GPS to ignore or
put
less priority on certain satellites? That would be a very cool
feature.


I don't know. First I thought it was a build in feature in all GPS
receivers, that they ignored satellites marked "unhealthy".

As I read the later parts of the article I got confused:

"...some users believe that the DGPS system is not necessary anymore.
However, this is not correct as the great advantage of the DGPS system
is the ability to warn the users in case of faults on the GPS/DGPS
system, by an "Integrity Warning". "

".... by using the DGPS system the users, as earlier mentioned, are
warned about faults in the system, as a "station unhealthy" alarm from
the Integrity Monitor is generated."

Does this mean that most of the GPS receivers that sailors use do not
have these facilities, and do not detect the "unhealthy" label ?

Would be interesting to find out. (One day, when I have the time...)


It's amazing how many people have no idea how to navigate without
GPS...
a lot of people who use to know are so out of practice that they are
functionally lost without it.

...we were rather sloppy for the first day...

Yes, when it (GPS) works so well most of the time, it is so easy to
get lazy. I know that from experience.

The following statement seems clear enough though:
"The circumstances of this satellite fault shows that it can not be
emphasized enough, that the GPS and DGPS users at all times should be
aware of the fact that the systems can fail. They should therefore not
blindly trust the electronic aids, but use all available aids to
navigation as radar, buoys and beacons and so on when navigating in
difficult waters."

Peter S/Y Anicula






"DSK" skrev i en meddelelse
...
Peter S/Y Anicula wrote:
I just found out that there are english versions of the pages I
linked
to:

http://www.frv.dk/en/nyheder/nyheder.htm#54
http://www.frv.dk/en/ifm/navigation/gps.htm

Thanks for the info & the links, Peter.

I'm not sure I understand this- you can tell your GPS to ignore or
put
less priority on certain satellites? That would be a very cool
feature.

It's amazing how many people have no idea how to navigate without
GPS...
a lot of people who use to know are so out of practice that they are
functionally lost without it.

On our last trip, a relatively short river jaunt of a few days
(rudely
interrupted by H. Bonnie and H. Charley), we were rather sloppy for
the
first day and had a lot of household junk piled on the chart table.
When
I realized I couldn't lay out a course, I threw it all on the floor
(I
was in a hurry, I cleaned it up myself later). We had a "serious"
talk
about the unwisdom of sloppy practices... the arriving hurricanes
later
in the week emphasized this!

Fresh Breezes- Doug King