The cache is not at the given coordinates.
You will need to solve the following puzzle to find the cache. They're not the biggest but this area will have been the venue for three.
N51 15[7] 14[3] . 14[7] 15[3] (17[3] + 14[7])
E0 (15[3]-15[4]) (16[3]-16[3]) . (14[3]+15[4]) 17[3] (15[3]+15[4]+15[7])
You can check your solution here 