This is the correct response. That was the first implementation of the treasure hunting mechanic and I had "beta-tested" it in that very thread.

It was loosely based off of the treasure map system in Wind Waker, where it showed you a vague landmass and you had to match it to an island.
http://www.zeldadungeon.net/Zelda09/Charts/TriforceShard04.png (Unsupported image host)