Required:
-* Switch map to (2D) WebGL to improve panning performance
* Improve tile cache:
** If cached tiles have changed, possibly also try (async) updates of other cached zoom levels covering this area
** Pre-cache tiles in adjacent areas and possibly zoom levels
+* Improve texture cleaning algorithm
* Show a notification when we are loading tiles or saved data
* Display length and duration of track
* Display movement speed
* Display location accuracy
* Show a better visible marker for the current location, possibly also indicating movement direction/speed
-* Smooth animations for zooming, probably using some canvas magic
+* Smooth animations for zooming, probably using some WebGL magic
* Use available larger/smaller tiles with resizing as loading placeholders while zooming in/out
* Better GPX saving implementation [blocked by missing web APIs]
** Set file name to save into to a good default (date + maybe some location name)