I did the instrument layout for a prototype business jet (never built), and the rules demanded a real, magnetic compass up on the windshield post, a regular clock, and a couple of other very primitive instruments.
If the fewmets hit the fan, a good pilot can take you home with those.
You look at the most exotic computerized glass cockpit of the most futuristic airliner in the world, and that little compass will still be up there, swinging gently back and forth.
It would, of course, be possible for an amateur sailor to go for years relying on the gadgets. But you are absolutely right that a smart one would learn what to do if the gadget failed, or got lost. And they always do.
I remember from Chapter 5 of Heinlein's "Starship Troopers," Sergeant Zim's lecture on the value of knives to men who would normally be operating computerized battle suits, and Rod's experienced military sister in "Tunnel in the Sky," explaining to Rod that the best way to survive is not to rely on a lot of fancy gear or weapons.
Off Topic » in reply to Far be it from me to slam GPS.
Good point.
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