I am not an expert. But I am installing a new garmin gps but keeping my older ray marine autopilot. I was told by the experts that they will interface, but some features of the garmin gps will not work with the existing auto pilot. Something about not being able to turn it on and off from the garmin unit. Unfortunately, I did not quite understand what they were trying to explain to me, so I guess I will just find out after the install. If I dont like it, Ill just change it out.
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