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Posted by Arne Schmitz on October 15, 2007, 10:12 am


I am using a Garmin eTrex (the simple, yellow one). I am using gpsbabel and
gpsman for downloading my stored tracks and I am visualising them with
Google Earth. I noticed that the stored tracks have a quite coarse
resolution which does not compare to the resolution I see on my device when
tracking "live".

Is this a bug or a feature? I.e. is this some sort of "compression" that is
applied when storing away one track?

Arne

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[--- PGP key FD05BED7 --- http://www.root42.de/ ---]

Posted by dold on October 15, 2007, 6:23 pm


> I am using a Garmin eTrex (the simple, yellow one). I am using gpsbabel and
> gpsman for downloading my stored tracks and I am visualising them with
> Google Earth. I noticed that the stored tracks have a quite coarse
> resolution which does not compare to the resolution I see on my device when
> tracking "live".

> Is this a bug or a feature? I.e. is this some sort of "compression" that is
> applied when storing away one track?

Yes. Compare the number of steps in the active log to the number of steps
in the saved log. I have an active log with 134 points, and the saved log
of that same track is 113 points. There are also no time stamps in the
saved logs. There is a maximum number of steps in a saved log that might
be less than the maximum in the active log.

I rarely save, unless I am in danger of wrapping around and overwriting the
start of my tracklog. I copy the active file to my PC instead.

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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5