Tested code with a 15 second recording interval.
A couple of bug revealed themselves.
One where the code seemed to resurrect itself and then fell over because it had cleaned itself up.
One where the map stopped updating after I had accidentally “dismissed” the program while it was recording. Hopefully this will be reproducable.
One where it took longer than 15 seconds to get a good lock, and consequently the next 15 seconds boundary was fairly far away, though I feel that this may not actually be wrong.
Battery consumption was
Before run: 6% in approx 1h20m = 4% per hour
During Recording: 25% in 2h 10m = 11.5% per hour
While Running: 35% in 3h 5m = 11.4% per hour
so @15 second intervals (actually a little less) = 7.5% per hour
pretty decent .. would give about 7 hours recording on 80% battery .. and I think it could be improved by deleting some background apps from my watch..