Now and then on Spearboard I'll see someone in Florida asking about a wreck or other thing and referring to it as having a "public number." Here's an example.http://www.spearboard.com/showthread.php?t=198543
I'm wondering what that means. Is it on a list of numbers published by a government agency, or just a spot that is on a commercially available list of spots, or what? In California we can buy Chart Guide books with lists of wrecks and reefs with their lat/long, but I've never heard those referred to as public numbers.