Maps are arguably one of the most difficult to find items. They do not provide sustinence nor can they be used as a weapon.
That said, I would see it as a definite plus if they would persist even through character death. If you happen to "find" one on a body of a player, perhaps rather than taking it, one could copy that piece into their own storehouse of knowledge of the game.
I think it would be a reasonable thing, as one can otherwise simply alt-tab into a browser to see maps online. Having it bound to one's character would nicely keep things in-game, saving immersion.
I love being able to personalize it with self notes.