AR Parrot navigation board pinout
I have found what the probable pinout is from here. In the comments of the link Anonymous says the pinouts are probably: 


: +Vcc (5v)
: PGED2/RP10(1)/CN16/PMD2/RB10 (8) (ICSP)
: Txd (to Navboard)
: PGEC2/RP11(1)/CN15/PMD1/RB11 (9) (ICSP)
: Rxd (from Navboard)
:/MCLEAR (18)
: GND
: GND