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Ublox GPS drifting when underwater/loss of signal

Hey Everyone!

Currently have a ROV with a ublox m8n gps chip inside.
When the ROV goes underwater the lat and long coordinates start drifting and jumping all over the place.
I know I cant get gps connection when underwater but can I make it when the gps goes underwater and losses connection the lat and long will freeze or disappear instead of moving all over the place?

Thanks for the help

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