i recently purchased a used avicx920bt. the map shows the location of the last owner which is about 30 miles away from me. I noticed the gps antenna doesn't have the metal sheet. Does that make a difference? Is there a part number or somewhere i can order? The gps wire is also not a constant flow of wire, there is near the antenna the wire is cut and held together by electric tape... i am safe to assume the factory did not do this? Is there somewhere i can buy the entire gps antenna, part number?

Also the ipod takes forever to load(as in never does fully load), i have 13000 songs. Is this a common problem? How can i speed up the load?

U only need the metallic pad when you're placing the antenna where obviously no metal underneath it. Check ebay for GPS antennas, they sometimes have OEM ones.

am i supposed to modify current location on the x920bt after buying it used or is the unit supposed to update itself if the gps is working?

You can set the Home location anytime you want.

am i supposed to modify current location on the x920bt after buying it used or is the unit supposed to update itself if the gps is working?

as soon as the system has a GPS lock, it should update your location to the correct place.