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Garmin GPS: eTrex Vista Cx Altimeter Problem

  1. #1
    Steve
    Guest

    eTrex Vista Cx Altimeter Problem

    To All:

    I have a perplexing problem with the Total Ascent field on my eTrex
    Vista Cx's altimeter page.

    I "manually" calibrate the altimeter at the trailhead, using the
    elevation on a USGS 7.5 minute quad. I hike to the high point of my
    trip and the altimeter page shows a very accurate maximum elevation. I
    return to the trailhead and the altimeter page shows a total ascent
    significantly less than that of the max elevation minus the min
    elevation. At home, when I review the profile of the track in
    MapSource, the minimum and maximum elevations are very accurately recorded.

    This problem has repeated it self on several occasions, including days
    that had a bluebird sky and very little barometric change.

    Apparently the altimeter on my my eTrex Vista Cx can record very
    accurate elevations but something is going wrong with total ascent
    computations. Is this a known problem/bug with the eTrex Vista Cx or am
    I doing something wrong and this is operator error?

    Thank you,

    Steve

  2. #2
    Joel
    Guest

    Re: eTrex Vista Cx Altimeter Problem

    >To All: 

    Its not you - I saw the same problem on a few hikes north of Las Vegas
    last month but never followed up on it.

    Interested to hear what Garmin says about this.

    Joel

  3. #3
    Wolfgang
    Guest

    Re: eTrex Vista Cx Altimeter Problem

     

    Some of the other gps's have a note on recent software that old
    firmware incorrectly calculated the total ascent. If the firmware
    were largely shared (which is it would be in any clueful company) then
    this could be a problem across the whole line.

    http://www.garmin.com/support/download_details.jsp?id=1245

    Changes made from version 2.60 to 2.70:
    ...
    * Fix issue where total ascent and total descent were incorrectly computed.

    -wolfgang
    --
    Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/

  4. #4
    Steve
    Guest

    Re: eTrex Vista Cx Altimeter Problem

    Wolfgang S. Rupprecht wrote: 

    Wolfgang:

    I will let Garmin know that the eTrex Vista Cx is also effected.

    Steve

  5. #5
    Dan
    Guest

    Re: eTrex Vista Cx Altimeter Problem

    Steve H wrote: 

    It sounds like it has the opposite problem I have with a
    GPSmap 76S. The altimeter is a bit noisy so the output has
    to be filtered to some extent. Too much filtering and the
    total elevation gain will be to low. Too little filtering
    and you'll gain a 100 ft. in a short period of time while
    standing still.

    If I climb 1,000 ft., the total ascent in the 76S will
    probably be somewhere from 1100 to 1200 ft. If I do
    the climb very fast, I might get the gain in the 1050
    to 1100 ft. range. If I stop a lot to take pictures,
    talk to other hikers, etc., I might get a gain in the
    1200 to 1250 range.

    --
    Dan
    (email change 2001 to 2004)
    (www.gpsmap.net)

  6. #6
    Steve
    Guest

    Re: eTrex Vista Cx Altimeter Problem

    Dan Anderson wrote: 
    I can be off (low) by up to about 40%


 

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