This format can...
read and write waypoints
read and write tracks
read and write routes
This format has the following options: title, serialnum, description .
Newer Lowrance HDS series units use a new format, USR version 4. Waypoints, routes, tracks are supported. The format is not completely understood, so certain extended data is ignored, but basic waypoint, route, and track details are all present. Icons are not currently deciphered.