Originally Posted by JoeDiver
Replace the fuse.
Then there was the couple I met a couple of years ago - their boat had three independent nav systems. They were sailing in Greece and the weather report was not accurate and the wind kicked up to around 40 45 knots as the sun went down and they were in and around a group of islands. No problem with the fancy GPS navigation
Then they took a lightening strike and took out all the navigation systems and most of the rest of the electronics.
At that point they were quite happy they had an old fashioned DR plot on paper - they navigated the old fashioned way to the next port.
Also having been on boats when the electronic systems had a bit of an issue for a while I was quite happy to have the old fashioned plot on paper and a navigation log .