V5.1.0 - 462 New altitude/heading shows incorrect Data

[Reinhard Punz]

In version 5.1.0 build 462 the new altitude/heading circular indicator appears horizontally mirrored.
Examples:
riding west lights the east/right segment
riding northwest lights the northeast segment
North and south appear correct, suggesting the widget mirrors east/west directions instead of having a 180° offset.
The issue is independent of map orientation mode (North up / Dynamic / 3D).

[Reinhard Punz]

Note: The displayed altitude is approximately 50 meters too high. Sometimes only 45 meters.

[Reinhard Punz]

Note: The displayed altitude is approximately 50 meters too high. Sometimes only 45 meters.

[Mzokk]

Standard GPS satellites don’t track your height from the actual ground (valleys, mountains). They measure your distance from a theoretical, mathematical model of the Earth called an ellipsoid. Your phone then has to translate that to "Mean Sea Level" using a gravity model, which can easily throw off calculations by hundreds of feet. In short your phone is not that accurate on the vertical plane. Even specific GPS devices such as Garmin are only accurate to +/- 30m unless they also take data from a topographic database which triangulates horizontal position with a topographical datum. My phone is a 60m out using MRA or OSMand (reading high) and my Zumo XT usually under or over reads by 20-30m

[Mzokk]

Oh and strangely it can be accurate at higher elevations. I was using MRA on a trip on Saturday crossing a pass at 448m and it was reading 447M passing the datum point??

[Mzokk]

I did a little experiment with this. My house is just below a 50m contour line. My phone using MRA gives 341ft or 104M.

Same with OSMand.

In OSMand you can download a correction file "World Altitude Correction"

This puts me at 157ft or 48M which would be within + or - 3m of my actual elevation.

Might be worth building in the correction file somewhere?

[Jörgen]

I noticed also that a correction of about -50 m is necessary.

[Jörgen]

Regarding the Noth segment display, I believe it was always correct.