Sounds like a bit of the "tin foil hat" problem!
What I might guess happening is that the GPS in the current location is getting too much interference from the electronics of the other.
What we can't see, without good equipment, is that we live in constant "stew" of electronic signals and those can get mixed into what the GPS, needs to receive.
What I suspect happening in your case is the entertainment system has components which put out interfering "signals" which the GPS picks up and it interferes with it's mind! They are weak as signals go and often do no harm, but if something is close enough, it can get into it!
Can we assume the entertainment has no blue tooth, etc. that could be turned off as a way to cut any output from that source?
Some things that might work to sort the problem is to move the GPS as far from the other as possible. Weak signals may only travel a few feet at a strong enough level to cause problems.
OR
Try to build a tinfoil or wire screen shield between the two. Tin foil is laughed at but actually putting metal between or around and grounding it can be effective to see if we can cut the interference between the two!
Perhaps an easy thing to build for a trial would be a simple box shape, fully open at the top but surrounding the GPS? Leave it open at front to see and at top to get the GPS signal but try to cut the path from the other system? Ground the screen wire and attach the wire to some metal part of the RV that is ground and move it around to see where and if it helps?
Interfering signals are hard to fight because we can't see them!
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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