Originally Posted by MarkofSeaLife
Or a blind confidence in paper.
Or blind confidence that navigational aids are actually there. Case in point: Chart says 55' lighted tower. When you arrive there you see a 55 gallon drum painted fluorescent orange. The Bahamian Harbor Master says, "Oh that tower! It blew down in a storm years ago so we put a 55 gallon drum in it's place."
No big deal. It only marked the entry into the harbor on which either side sat shallow shoals that would ground any boat with a draft of 3' or less.