Yes, the 7D means a directon. You are looking for a very old message and this could be left in a very old object or building. So you need to know which buildings were standing in those old times. There is a map somewhere showing such old buildings - you have already seen it
Did you also buy a little wooden minaret from the souvenir merchant? Use that on the old map to get a kind of mockup of the area. (The binoculars will also be needed but only later).
