20.1: Improved performance when displaying thousands of waypoints. Warn if more than 10,000 tracklog points loaded. Option to set default waypoint prefix. Added zone to "Show location in all formats" page.

20.0: (1) Added a "reference set" option on main page menu to show waypoints and tracklogs from other files on the map pages, without loading them into the working set. (2) Improvements to appearance of main page. (3) Require device to have a GPS before installing this app.