Originally Posted by
tiger beetle
Hi Philippe - an indirect (or direct) lightning strike to the boat is a more likely issue than the GPS constellation failing. A strike will take out the boat's on-board equipment containing integrated-circuits (IC) chips, at which point you're toast. I do carry a sextant, printed nautical almanac, HO 229, and believe it or not an analog/mechanical wrist watch - no battery inside the watch. I even know how to use it! Add some plotting paper and large scale paper charts, a pencil, straight edge, protractor - and you're good to go.
Perhaps super-old fashioned, but that stuff does help me find out where I am when all the fancy stuff is toast. And I have a Monitor windvane - not that you'd want one of those bolted to the transom of your Class 40! Lightning squalls are no fun, lightning bolts to the water are even worse.