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GPS Connectivity for your Macintosh
LoadMyTracks is a piece of software that will communicate with GPS devices from many manufacturers to send and receive data. It can also be used to translate data between the popular GPX and KML (Google Earth) formats.
The software provides support for Waypoints (single locations in space), Routes (lists of waypoints that can be used as instructions of where to go, Tracks (the breadcrumbs that many GPS devices keep to show where you have been) and additional data that may vary by device.