Completely wrong values for Ascent and Descent on my montana 750i

2627235 over 1 year ago

Whenever I go hiking I immediately see the value of ascent going up .... much more then the actual.

I went for a hike 12m up and the montana showed 68m ...

Why do I get such erroneous values ?

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Garmin-Leslie over 1 year ago +1 verified

Hello 2627235, I would recommend reading through this article to understand what to expect for the accuracy of the elevation on your unit. Elevation Accuracy of Outdoor and Fitness Devices

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0 twolpert over 1 year ago

That's not actually horrible. Remember that the vertical error in a 3D GPS fix is much larger than the horizontal error. I do not know if anything other than the GPS information comes into play here. For example, I don't know whether or not the altimeter comes into play.

0 2627235 over 1 year ago

Thank you for you reply.

I do think it is the altimeter. Should I switch it off to use only GPS attitude?

There is one more thing I consider to be the cause, I put the device in the pocket of my trousers, might that cause a compression/decompression at each step that makes the altimeter go crazy ?

0 atlas_cached over 1 year ago in reply to 2627235

For short hikes, set altimeter to calibrate continuously. For longer hikes, set altimeter to calibrate once only.

+1 Garmin-Leslie over 1 year ago

Hello 2627235, I would recommend reading through this article to understand what to expect for the accuracy of the elevation on your unit. Elevation Accuracy of Outdoor and Fitness Devices