garmin hookup to raymarine autopilot

Hi folks,

I'm trying to get my Garmin 982 NMEA 183 to talk to my newly installed
Raymarine Pilot. There are two Garmin NMEA out wires, but one of them
is ground. Since the pilot 'brain' is already grounded, do I need to
attach the ground from the garmin to the ray pilot? The brain has two
terminals for "in" and two terminals for "out". Makes some kind of
sense that it should have two wires, but I don't understand the point
of ground since it's all a common ground, pilot, garmin, all goes to
battery negative.

any suggestions?

thanks

Luc
.

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