On Wed, 2 Jan 2008 15:54:59 -0800 (PST), luc wrote:

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


The "-" NMEA input lead on the autopilot should be connected to DC
ground, and the GPS data out connected to the autopilot "+" input.


Officially, NMEA-0183 should use a 2-wire connection, but many
manufacturers only use a single-ended connection.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca