Fenix 6 pro wrong ascent calculation

Yesterday i tested my recently bought Fenix 6 pro on a circuit hike.

The Start- and Enpoint were the same at 580 m altitude (tracked: 583/593 m), the highest point was at 1748 m altitude (tracked: 1724 m), a difference from about 1168 m.

The reports on the Fenix 6 and Garmin Connect show an total ascent from about 884 m and a total descent from about 1092 m, not consistent.

The altimeter seems to work, at the Start-/Endpoint at 580 m the Fenix shows 583/593 m, on the top at 1748 m it shows 1724 m and at a hiking hut at 1461 m it shows 1450 m, i think thats absolutely ok.

I exported the tracked (with the Fenix) hike as gpx and looked at it with different Apps, in these Apps the total ascent is about 1190 m -1290 m which seems more accurate than the 884 m.

The tracked route looks really nice, the GPS-Signal seems to be really constant.

How could it be that the Fenix calculates obviously a wrong total ascent, but the altimeter seems to work well and the tracked map seems to be accurate?

Settings:

- 3D-Distance on

- 3D-Velocity on

- Record-Interval: 1s

- Auto Ascent off

- Climb Pro off

- Auto-Pause off

  • Hello

    What about température and moisture ? Could you see any spike on the altimeter signal ? If yes it can be due to sweat on your wirst 

  • Thanks for your reply.

    Temperature and moisture should be constant over the time.

    The tracked elevation profile looks very smooth, on the red mark you see a jump, but that was my fault, i forgot to resume the activity and noticed that after a few minutes but that shouldn't affected the total ascent in that manner.

    I noticed at a slow and steep part of the hike that the gained ascent meters didn't increase, like it was stuck, but if you look at the profile there is no jump in it.

    I think the tracking and calibration (Altimeter) seems to be fine, i think there is a problem with the calculation.of the total ascent.