The only critical message we require is GGA. If possible, you should also enable either VTG or RMC messages as this provides speed and direction and will make the map rotate correctly.
TURN ON GGA AND VTG (OR RMC) MESSAGES AT 5Hz OR 10Hz (Some receivers don't support 10Hz, or don't seem to actually transmit when set to 10Hz, so if you have issues setting 10Hz please try 5Hz).
SET THE BAUD RATE TO 38,400