GT680w GPS Module Accessory | Ships from USA
Plugged it in, found the satellite, and worked.  Purchase was flawless.  Delivery was prompt.  Packaging was safe.  Price commensurate with overseas alternatives.  The side that MUST face the satellite is opposite the rectangular recess sized for the included double sided adhesive pad.  Seems intended for mounting on the backside of mirror, but will throw you for a loop if you put the rectangular recess against the windshield.