need some info


have a garmin nuvi 5000 and wanted to know what the ports on the mount are for. i know what the a/v port and the audio out is for and the port for the msn power cord.but what is the other for? the one on other side. what is the usb port for? i plug the it on to the computer and nothing happen. ( i am talking about the usb on the mount not the unit) if any one can help please let me know

garmin nuvi 5000 & nuvi 200w