Bill Kearney wrote:
The point is that GPS SYSTEM, though phenomenally accurate MOST of the
time can fail SOME of the time.

More likely your unit wasn't picking up enough satellites. This is not the
fault of the GPS system. Some older units didn't do a very good job of
pickup up sats when there's overhead leaf canopy (some still don't). Don't
blame the system for inferior equipment.

An anchor watch in open water, without high terrain or foliage nearby, will
likely be very consistent in it's location.

If you are interested I took a picture of my plotter which I posted here.
http://ph.groups.yahoo.com/group/sho...os/browse/bd9e

Which is a useless link unless someone joins that group. Try using a free
service like flickr instead of forcing people to join (and presumably then
leave) a group.


You may well be correct that I was not picking up enough satellites.
Although in this particular case there was not much overhead canopy,
just a bunch of stunted (but dense) fir trees on either side.

As I recall the number of satellites varies, some times more, some times
fewer. And if the antenna does not have a clear view of the sky it may
be off. I believe it is also possible for a reflection to cause an
error, though probably not much of a problem unless you are in Miami.

Still I take your point, lack of signal was the likely cause.

Also, I said AIS when I meant to say WAAS - oops.

No intent to make you join a useless group.

Try http://s23.photobucket.com/albums/b384/hpeer/ if interested.

I think that should work.

Howard