Erebus
On the numbers on the prop if it is older you may want to take a wire brush to the hub and clean off exhaust and corrosion. If that hasn't been suggested yet.
Also on the Garmin try mashing the Power and Page buttons at the same time as you turn it on. Hold them down until you get to accept or agree screen and that turns yellow. Then release the power and continue to hold the page button until it finds satellites.
I got that from the PO of my boat for the Garmin unit it came with and it works.
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