Someone who doesn't know how a map works, likely won't have much other survival skill giving him benefit from the map cooking method.

Personally, destroying my only map (or risking it) would be the last desperate method that I would consider trying.

Survival tip number one is btw not bother much with foraging or trying to boil potential poisonous plants to mess up your stomach, but find the best direction and focus on walking, if no help will come.

(One can go without food for days, but not without water)