GPS accuracy when sat on a window ledge, avg distance between fixes = 3.36m, max dist = 18m

I'm thinking about how to improve navigation to waypoints and routes and what is / what is not possible.

Did some experiments with the GPS against my Garmin eTrex and noticed at one point I seemed to be suddenly 20m from my previous position when in fact I was standing still. The eTrex kept solid but the UBLUX GPS wobbles a fair amount.

I wrote some code that set the GPS in SuperE mode and waited for at least 2 fixes then started to log the distance, average and max distance between subsequent fixes. The results are below:

distance: 3
avg=3.36624203821 max_dist 18
>Bangle.setGPSPower(0);
=false
> 

So it might be necessary in some situations to use a rolling average of 3-5 fixes (when stationary).