GPS quirks

Posted by Rod in S.F. Ontario, Cana on November 08, 2004 at 13:55:22 from (209.71.222.66):

In Reply to: Re: Why is GPS off? posted by Harley on November 07, 2004 at 08:52:00:

My Garmin Etrex is often accurate to within 30' if the stored signal is not too old.

The odd thing is that from fall to spring I have noticed my dock moves about 650 feet out into the lake. Maybe the satelites shift a bit. Who knows?

It's still a neat toy, and a pilot friend told me that many airline pilots carry them in their pockets now, after someone got in to a safe landing in England after an electrical failure wiped out all of the liner's navigation instruments except the pocket GPS he had along.

I don't think I would trust my Garmin for altitude: on Route 81 I've read 400' higher at the bottom of a large hill than at the top.

Oh yes, and my friend's home in Reading, PA, is 1/2 mile from its Lat and Long on the map. Burke's County was surveyed in the mid 1600's, though, and that might account for the error.

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