[Fuzzdr]

Hello All; I have a Tiara 4000 Express Cruiser /97. I had a local marina swap out my Raymarine electronics for Garmin equivalents. I am having various problems most notably with the autopilot and open array radar. As the installer has not been helpful, I want to check things out myself. starting with the new chart plotter and radar. I did install similar Garmin units on another boat 9 years ago and that has gone well. For starters, I would like to know a practical way to install the RF ground wire between the radar voltage converter and RF ground. I cannot remember if I had installed a RF ground plate on the other boat or if I used something else? The rest of the wiring seems be very straightforward. When it comes to grounding AC, DC, RF, and Lightning return circuits things can get very complicated with isolation devices, capacitors, etc. I am not looking to install a system that would make a top marine electrical engineer proud. I just want to do what is safe and practical.
 Re; the autopilot problem, I seems like my unit was not calibrated properly or at all. I was dismayed to find that the little model of my boat was not moving ahead with me on the chart plotter display, but backward to where I had come from. It sounds humorous but in reality it is not.  I understand that this can happen when heading sensors (in autopilots) or when electronic compasses have not been properly calibrated. This seems to be my problem and hopefully a re-calibration of the autopilot will remedy the situation.
Any assistance or comments will be appreciated.

Fuzzdr