Humminbird and navionics blinking gps

Captain A-DadCaptain A-Dad Posts: 88 Greenhorn
I have a Humminbird 987 with a navionics card installed. Lately after a little use, the gps data blinks so color changes from blue to white with no data then stays all white. I can shut off unit and turn it on and it will work for a little while then goes out again. I don't know if t is the gps or card. Unit is 7 years old and not serviced any more. Could also be a bad card. Any suggestions?

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