If you drop a KGGB at a selected GPS point it says after dropping "GPS data not found", am i doing something wrong or is it bugged? I mean it works with other GPS guided bombs.

EDIT: Ive found it out. You have to use the PDU Device and The Mission Planning Laptop. The PDU Device can be found in the Arsenal in the same category where u can pick up the GPS and the Laptop can be found in the props.