RE: [Paddlewise] GPS errors

> -----Original Message-----
> From: owner-paddlewise_at_lists.intelenet.net
> [mailto:owner-paddlewise_at_lists.intelenet.net]On Behalf Of
> HTERVORT_at_aol.com
> Sent: Saturday, March 13, 1999 1:40 AM
> To: paddlewise_at_lists.intelenet.net
> Subject: Re: [Paddlewise] GPS errors
>
>
> Recently there have been several threads going on this list about
> choosing a
> GPS and I thank everyone who contributed.  I learned a lot.
>
> I don't mean to reopen those discussions, but a question came up the other
> night which I felt y'all could help me with.
>
> A friend of mine went sailing as part of a class, and there were
> 6 handheld
> GPS units on board, plus the large console GPS installed in the boat.
> Throughout the trip, the console unit consistently indicated
> positions which
> were 3 miles off of the positions shown by the six handheld units and the
> compass-bearing fixes taken by the students.  Now, naive Harold
> always assumed
> that a GPS either worked accurately or not at all.  Apparently not.
>
> Would this discrepancy be due to improper factory calibration of
> the unit, or
> can a unit slip out of calibration?  Or might the discrepancies
> be due to the
> installation of the ship-mounted unit, or what?  Inquiring (armchair)
> navigators want to know.
>
> Oh, one other thing.  I've heard of cases where people have
> thought their GPS
> was off several miles when cruising or paddling in Baja, only to
> find that the
> Mexican maps were the source of the inaccuracies.  But this trip was right
> here in So. Cal., using NOAA charts, and all but the console unit
> agreed with
> the charts.
>
> Any ideas?
>
> Harold
> So. Cal.
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