Finally found the fecking wobbles

I ‘think’ there are two factors: the colder temperature reduced the power of the LiPo; this then made the system a little less able to react to distance errors, causing it to rotate more to correct horizontal distance drift, and this in turn exposed a long term bug that completely failed to compensate for horizontal distance changes due to changes in pitch / roll angles (the code was there, but had a crass bug).

The cool LiPo has been fixed with a walkers / skiers pocket-warmer strapped firmly on top, keeping it lovely and cosy.

The crass video horizontal tracking error has been fix also.  As a result, GitHub has been updated, and naively once more I can continue working on the GPS tracking.

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