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Height (in the Altimeter) is incorrect.

MarinusvD
over 5 years ago

I notice that the value in the Altimeter screen on the 945 is constantly incorrect.

Once i try to calibrate, take the choice with GPS!, it says go to open field. There is where i am at that time.

Once i suceed to finish the calibration the height is much better but after a short while it is again incorrect

Height is around 50 meters whilie i live in the netherlands a few meter below the water surface.

Somebody recognize this ?

  • 0 over 5 years ago in reply to MarinusvD

    interesting... and, to me, strange... I would expect some sort of calibration would be necessary after a plane trip or something similar but on a regular use I thought it should be fine... 

    I wonder if the 920xt had this issue as I always heard good reports about them (never had them).

  • 0 over 5 years ago in reply to MarinusvD

    I calibrate prior to any activity. Depending on pressure and elevation changes a drift you're experiencing isn't uncommon after several days. Here's another thing you can do if you haven't done so already.  If you keep your watch connected to your phone during the night, turn on calibrate "not during activity".  The watch will use the GPS location from the phone and then calibrate the altimeter using DEM while in your set sleep window. 

  • 0 over 5 years ago in reply to sdantasbvi

    920 XT never had this problem as well

  • 0 over 5 years ago in reply to MarinusvD

    You will have to calibrate every barometric altimeter after:
    big changes in location/elevation in a fast time (car driving, train travel, flying)
    big changes in air pressure (weather)
    longer periods of time

    There is now sensor wich it is not necessary. Sometimes it is done via software (auto calibration on Garmin watches), sometimes you have to do it yourself.
    The 920xt also had this "issue" because it is no issue but normal behavior.

  • 0 over 5 years ago in reply to sdantasbvi

    sdantasbvi, regular calibration is needed for weather changes.  The watch uses pressure to compute elevation.  So if the pressure changes (which it is doing constantly, but not by much generally unless a storm is coming through) the elevation on the watch will change.  Calibration is what corrects for this.  Under normal usage, it will occasionally calibrate during the day (I believe) but not sure the frequency.  It needs to get a good GPS lock in order to calibrate. 

    Depending on your activity settings, it'll probably do a calibrate when you start an activity, and then continuously during the activity.

  • 0 over 5 years ago in reply to BeneGi

    Well my FR-920 never gave me (at sea level where I live) a reading of -500 mts or even worse 21000 mts as is usual with my FR-945. I am totally disappointed with this watch. Bad altimeter, bad GPS lock, etc...

  • 0 over 5 years ago in reply to tess

    Thanks Tess, good to know! Where you found these details?