Okay, another issue you may not be able to help with:
I use MM while on foot (kinda useful and rather cool when you lose the trail under canopy), often in areas where satellite signal strength and fix varies. Now, I've noticed that when the MM/GPS system starts losing a fix, the imprecision skews along one axis. The resulting track shows the imprecision areas clearly as skewing along the same axis (I can get you a track if you like).
Does MM handle the GPS location calculations? Is this single-axis skewing along the direction of a particular satellite? Is there a way to judge the confidence of a fix, and "smooth out" the harshness?