Celtic Heroes

I have 2 sea charts, I'm a level 81 ranger btw. I don't know how I got the charts, or what they do. If someone could tell me what they do? And what they're worth, because if I don't need em, I might as well sell them.

They r for met weapon and u only need one

They r for met weapon and u only need one

Well then I wanna sell one. How much can I sell em for

its extremely easy to get so you might as well drop it cuz chances are that nobody will wanna buy em

Yea I have over 100 sea charts to neek and 81 to uoise. Captain black storm drops em