** Use an intelligent algorithm to automatically try (async) updating tiles if they have a certain age
*** If they have changed, possibly also try (async) updates of other cached zoom levels covering this area
** Clear cached tiles option
+* Find the bug that messes up the display when panning on not fully loaded tiles (web connection down)
* Show a notification when we are loading tiles or saved data
* Display length and duration of track
* Display movement speed
* Full screen mode
* Save GPX tiles to the web (OSM? Public cloud service? Private service?)
* Better GPX saving implementation [blocked by missing web APIs]
+** Set file name to save into to a good default (date + maybe some location name)
Nice To Have: