I just got my G4 installed and couldn't get my gps receiver to work either. Only mine hasen't worked at all. When I try to use the option to "detect" the receiver I get the error message:
" A valid device could not be found on any of the COM ports! Please try selecting the proper COM port manually."
I looked through the manuals for the G4 and Streetdeck and couldn't find anything relevent. Someone posted something about changing the baud rate to 9600 for their gps receiver to work with Streetdeck but it wasn't related to the G4. Can anyone offer any input on this?