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The GPS antennas are sealed so I don't see why they would ask if you sprayed the hose at it...it won't matter. I did some fishing this past year in the Keys on a boat with the same system you have and I scrubbed the GPS antenna and sprayed it directly with water and it did not have water intrusion.
Do you know which GPS antenna you have? Also, do you have any other equipment that may be interfaced to the MFD? I am assuming that you have a NMEA2000 antenna (model GP330B). If this is the case I would first check the NMEA2000 backbone. If you don't know what that is look for some cables all plugging together via Tees. there will be 2 cables per tee and the tees plug together. Make sure that there is a terminator at the end of the tee block. If you have the NMEA2000 antenna the other terminator should be in the antenna itself.
Do you have the engine interface wired to the MFD? If so, unhook that wire. I have seen some really weird things happen if the engines are sending some information back to the display.
We have installed many of these systems and the only failures I have seen are people damaging the radar antennas. The systems we have installed have been bulletproof for the most part.
This is a bit of bummer. Usually (and I hope in your case too) it is just a software problem. As a navnet is basically a computer this can happen. First I suggest you unplug everything except power and start it up, just to see if something on the network port isn't messing it around. If it still gets stuck take it to your local Radio Holland office or another furuno certified service outlet to reload the software.
ahh, this is an old one
check the book.(ha, ha)
Press and hold menu during start up
Choose "Installation Mode"
Select "Radar Set Up"
Press "Next Page"
Select "Radar Heading Alignment"
Use knob and follow prompts, you will place the dotted line at dead ahaed and the
Also, remember to TUNE VIDEO
the output forom the Furuno GPS (like a GP31) will be yellow and green, hook these to theinput on the plotter blue (or black) and white.
Use Data1 on potter as the input and select a nav source of "ALL" in setup menu.