Lampouy - Megalith Alignments

How did anyone move such huge stones? What is the meaning of this strange arrangement?
It is whispered that Korrigans, the legendary spirits of Breton folklore, come out with the full moon to dance around the menhirs. If you start your hunt for this cache at dusk, stay on your guard...

Departure

Park in the lot available at 48°18,158N   002° 04,352W, then set out on foot.

The Site

The menhirs that make up the Lampouy site date back to the Neolithic Period. What is unique about them is that they are laid out like the fingers of a hand, along five lines oriented from north-northwest to south-southeast. Our journey leads us to one of these alignments, called "Des Rochers." Despite certain deteriorations, this is one of the best-preserved alignments of the entire site.

1st Riddle

First stop at the sign of the menhir stone long, on which you collect your first clue. Count the characters on the panel, and note that number: we will refer to A as a result of the puzzle.

Go to 48°17,907N  002°,04,649W

2nd Riddle

You're almost alignments!

Few menhirs are still standing. Count the menhirs and hold the highest figure. This nomber will be the letter B in the coordinates of the final cache.

The Cache

Now you can reconstitute the coordinates of the final cache:
48°18,AA9 N
002°04,B68 W

Hint: you take the path of standing stones, along the 48 stones that make up this site ...