MP 85º latitude limitation

[Webillo]

This is a simple mission near the North Pole (89,0), done virtually with a balance bot without GPS, using its wheel encoders. It should be a straight line south east (135º). The 3D plot draws it correctly:

20221014 Barbie-13 Balance Bot PIP indoor mission straight PIP 5K 5120x2880 (no GPS, wheel encoders)

(There is only one compass (Pixhawk internal), so there is a small orientation error (or perhaps it needs a better compass calibration or magnetic declination adjustment)).

However, MP both on its window and on the .tlog show the balance bot moving along an east west line (0º) instead:

20221014 Barbie-13 Balance Bot PIP indoor mission cap+tlog PIP 5K 5120x2880 (no GPS, wheel encoders)

It appears that the balance bot can move sideways at 45º, but that is impossible.

All waypoints above 85º (or below -85º at the South Pole) are clamped (a white background is shown in MP (and in other GCS’s)). What is the reason for that limitation?

Obviously a balance bot won’t do really such a mission at such latitudes, but it is conceivable that a drone or boat could do it.

[LupusTheCanine]

At extremely high latitudes typical cartographic projections get wonky. Very few people fly there so tester base is virtually null and it is better for a feature not to work at all than be broken.

[Webillo]

@LupusTheCanine

cartographic projections get wonky

Certainly, but at 89º all seems to work (possibly further), FC navigation works, 3D representation is correct, so 85º is a great limitation.

Representation limit and navigation limit should coincide.