The Garmin eTrex Mariner is fully supported by GeoBuddy.
GeoBuddy can connect to the Garmin eTrex Mariner 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 eTrex Mariner can hold 500 waypoints. Waypoints on the Garmin eTrex Mariner can contain up to 10 characters.
These are the waypoint symbols for the Garmin eTrex Mariner that are displayed in GeoBuddy:

The eTrex Mariner can hold 20 routes, each containing up to 50 turns or stops. Route names on the Garmin eTrex Mariner can contain up to 13 characters.
The eTrex Mariner can hold 11 tracks. Saved tracklogs on the eTrex Mariner can have up to 250 trackpoints. The active tracklog holds 2048 trackpoints. Track names on the Garmin eTrex Mariner can contain up to 13 characters.
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