I still have not got the GPS module 73102 to work. I have set the right port up for the port that I have wired it to, And chosen the GPS module from the menu. It should be GPS 2 for the moving map source. but when I change to GPS 2 for the map source, the map page, says NO GPS. Is there any way of testing to see if I have a defective GPS module 73102. I have good known ground and 12v power to the unit. Looking for any help.