The Garmin StreetPilot c550 is fully supported by GeoBuddy.
GeoBuddy can connect to the Garmin StreetPilot c550 to transfer geocaches and waypoints. Your GPS stores its data on a memory card. GeoBuddy will read and write geocaches and waypoints to and from this card, and can display your GPS data over USGS topo maps and aerial photos.
The Garmin StreetPilot c550 can hold 500 waypoints. Waypoints on the Garmin StreetPilot c550 can contain up to 30 characters. Waypoint comments or notes can contain up to 255 characters.
These are the waypoint symbols for the Garmin StreetPilot c550 that are displayed in GeoBuddy:

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