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Old 13-06-2020, 10:00   #1
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Black spot on Plotter

I have a Raymarine C90W chart plotter. On a hot day with direct sunlight, it developed a large black spot on the screen. What is it? And can it be removed?
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Old 13-06-2020, 10:33   #2
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Boat: Outremer 50S
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Re: Black spot on Plotter

Does the black spot look a lot like this?

If so it is most likely a sunburned polarizing filter on the front of the display. It could be in the display itself, but most (?) of the time it is a plastic polarizing film bonded to the display. If you want to go that far you can disassemble the whole thing, peel off the film, and apply a new one. Then put it back together trying to make sure it is sealed against water. You can get the polarizing film sheet (self adhesive) on Amazon and watch a generic YouTube on the replacement.
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