* Smoother animations for panning
* Smooth animations for zooming, probably using some canvas magic
* Use available larger/smaller tiles with resizing as loading placeholders while zooming in/out
-* 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)