The Garmin GPSMAP 135 Sounder is fully supported by GeoBuddy.
GeoBuddy can connect to the Garmin GPSMAP 135 Sounder to transfer geocaches, waypoints, routes, and tracks through your computer's serial (COM) port, and can display your GPS data over USGS topo maps and aerial photos.
The Garmin GPSMAP 135 Sounder can hold 250 waypoints. Waypoints on the Garmin GPSMAP 135 Sounder can contain up to 6 characters. Waypoint comments or notes can contain up to 16 characters.
These are the waypoint symbols for the Garmin GPSMAP 135 Sounder that are displayed in GeoBuddy:

The GPSMAP 135 Sounder can hold 20 routes, each containing up to 30 turns or stops. Route names on the Garmin GPSMAP 135 Sounder can contain up to 16 characters.
The GPSMAP 135 Sounder can hold 1 track, containing 768 points.
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