Connect your GPS unit to your PC Transfer routes and waypoints to and from your PC Download map detail from MapSource CD-ROMs Cable features standard 9-pin D connector Convenient and easy to use This cable allows you to make a powerful connection between your GPS and your PC. Create routes and waypoints on your PC and transfer them to your GPS. Also allows you to download map detail from MapSource CD-ROMs to compatible units. Cable features a standard 9-pin D connector. Does not provide wiring for external power. Garmin's PC Interface Cable allows you to connect your GPS unit to your PC. Now you can create routes and waypoints at your leisure on your PC and transfer them to your GPS. You can also easily download map detail from MapSource CD-ROMs to GPS units. The cable features a standard nine-pin D connector for ultimate compatibility. Note that the Garmin PC Interface Cable does not provide wiring for external power.
The quality of this cable is fine, but it doesn't give you access to the power pins that are in the Garmin interface. Get the cable that does power and data instead... or if you're a hardware geek, then make your own with the stuff from purple open projects (pfranc.com)