Les Vignes

On this short walk, you'll discover the village of Buffard, with its narrow lanes behind gardens and houses, and its vineyards.
Along the way, you'll need to collect clues to find the GPS coordinates of the treasure.
Here they are, in code:
N 47°0 (number) A.BCD
E 005°E.DAC'
Now it's up to you to turn the letters into numbers.