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If you peer into the screen can you make out anything on it like as if the back lighting is bad? Also it may be set to night mode as well. You can try a factory reset. I have seen their screens go bad from time to time. If none of the above work. Send it in to Raymarine.
The direction of the boat symbol is depending on the compass course from the autopilot. You will see that your GPS course (COG) and magnetig heading on the autopilot differs. Solution is to calibrate autopilot compass. Will advice you to not use course up, stick to north up or heading up.
This is a common problem if the GPS is hooked up to an electronic heading sensor such as an autopilot. If the heading sensor is not calibrated properly, the boat will appear to be facing the wrong direction.
If you have an autopilot, consult the installation guide and perform the sea trial procedures. That should get your boat lined up properly.
Remove all wiring from 4000 head, hook up only 12V, if seatalk fail continues, it is the head. if seatalk fail goes away, hook in instruments one by one until the bad head is found. Seatalk is 12V red, Ground Screen(bare wire) and Data yellow (pulsing voltage).