It looks like many 2010+ Nissan and infiniti vehicles that have NAV use the same "AV unit"
They have many different part numbers (25915-xxxxx), but the pinouts from the Clarion service manual show the 370, Murano, Maxima, G37 and GT-R to be the same. It also shows the Nav unit has an unused 5.1 audio output and an unused composite video in.
I can't wait for the AV unit to arrive and start to reverse engineer it!
Estimated delivery is 11 days away