0.01: First release
0.02: Bugfix time: Reset minutes to 0 when hitting 60
0.03: Fix distance >=10 km (fix #529)
0.04: Use offscreen buffer for flickerless updates
0.05: Complete rewrite. New UI, GPS & HRM Kalman filters, activity logging
0.06: Reading HDOP directly from the GPS event (needs Espruino 2v07 or above)