Basic navigation skills that can be plenty for emergency purposes. For example in the midcoast region of Maine all you have to be able to do is paddle north - hang the fancy chart work - and you will eventually bump into land. Then all that is left is to figure out which land - but at least you are dry.
It is one thing to rely primarily on navigation via electronics. It is quite another to find yourself in a lurch because the few hundred dollars worth of electronics failed and you aren't carrying a $20 strap on or $10 pocket compass.
Electronics that are totally reliable anywhere else get funky around cold salt water. I needlessly replaced two cell phone batteries before I found that the old ones held a charge just fine once we got inland again. And each laptop we bring to the coast will inexplicably lose some function that worked fine at home and will again upon our return.
Reflective Hull Decals
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