Marnela.
Get the Besaid key. If you have it, the first mini-commsphere (I'll put this down as a spoiler for those who want to find them on their own) is (SPOILER) in the grassy area on the left hand side of the village near the Crusaders tent thing. When you find it push X to view the village better and point the camera between the crusaders lodge and the tree on the right hand side of it, and there will be a cipher with a number there.
The second commsphere is on the village slope, opposite the save sphere, point the camera at the trees that are all clumped together and focus on the cipher behind them on the hill.
The third one is between two posts that are near the waterfall. (They are about 11 or 12 posts from it.) zoom in on the waterfall to see the cipher.
And finally, the fourth one is at the end of the path just before the beach (hopefully you know the one i mean) go right to the end of the path and it is on the far left of it. Point the camera at the small palm tree in the distance. I had trouble finding the last cipher and it took me ages to find.