As per Ray manual.
GPS signal via NMEA
IN onto Ray box. This will provide Ray instruments / AP with GPS data.
PC onto the box via OUT for PC listening (nav data, pos, etc.), via the box's IN for sending (e.g. WPTs to the AP).
Now the radar may be able to pick up the WPT data and pos data from the box's NMEA
Hold on as other's may have more personal insights.