Map Controls

During an activity, the map controls should disappear after a few seconds of inactivity.

On the map, there are four controls: plus & minus to zoom the map, hand to pan the map and an arrow to change the map's orientation (track up vs. north up).  These controls overlay the map and cause the map to be cluttered.  Tapping the screen should cause the controls to appear and after a period of inactivity (a few seconds) the controls should disappear.