Using the Radio Shack TripMate with the Kenwood TH-D7A
The TH-D7A (And I presume the TH-D7E) comes with a short 3-conductor cable with a 2.5mm plug on the end. The pinouts are as follows:
Tip - Radio TXD (Connect to GPS Data In) (Red in included cable)
Ring - Radio RXD (Connect to GPS Data Out) (White in included cable)
Barrel - Ground (Connect to GPS Ground)