Is the GPS plugged into the correct port on the computer?
When hardwiring GPS to a PX-501, use the 9-pin COM port located on the right hand side of the computer and choose COM1 in your setup.
AFL2-12Ai5 users should plug their GPS into the 9-pin COM port located on the bottom of the computer and choose COM1 in your setup.
If you have a PX5R mounted to the back of your PX-501 computer and you get a “No GPS detected” error, contact your local dealer for support.