[OSM-talk] Garmin eTrex Vista Hcx

edodd at billiau.net edodd at billiau.net
Sat Oct 31 20:02:24 GMT 2009

> Hi!
> Shalabh schrieb:
>> Would just like to figure out if any of you have had the same issue with
>> this model or any other Garmin GPS.
> I have a similar Issue with the Garmin Vista HCx. Occasionally I
> observe, that the GPS position is way off the known road/path I am on.
> The satellite accuracy is high +-5m.
> When I switch the device off and on again, it positions me right where I
> am supposed to be. So it seems to accumulate some sort of error in its
> internal calculations and needs the occational reset when it is "going
> wrong with great confidence"
> bye
> 	Nop

All of the matters described are possible at all times with a GPS system
of position finding.
However the notes that some accumulate errors are significant, and again
may refer to particular firmware so that it will be difficult to determine
the actual cause.
150m horizontal error, for example, across a time gap of a few hours, may
well relate to changes in satellite position and reflection of signal
occurring one one but not both times.
Vertical errors are greater at all times.

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