The Garmin eTrex Summit HC is fully supported by GeoBuddy.
GeoBuddy can connect to the Garmin eTrex Summit HC to transfer geocaches, waypoints, routes, and tracks through your computer's USB, and can display your GPS data over USGS topo maps and aerial photos.
The Garmin eTrex Summit HC can hold 1000 waypoints. Waypoints on the Garmin eTrex Summit HC can contain up to 14 characters. Waypoint comments or notes can contain up to 30 characters.
These are the waypoint symbols for the Garmin eTrex Summit HC that are displayed in GeoBuddy:

The eTrex Summit HC can hold 50 routes, each containing up to 250 turns or stops. Route names on the Garmin eTrex Summit HC can contain up to 14 characters.
The eTrex Summit HC can hold 21 tracks. Saved tracklogs on the eTrex Summit HC can have up to 750 trackpoints. The active tracklog holds 10000 trackpoints. Track names on the Garmin eTrex Summit HC can contain up to 14 characters.
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