The coordinates point to the 'heart' of Sant'Antonio. Park your car here. Get hold of the year and make the simple calculation. Get the cache and enjoy the view. You can also climb around on those stones...
Happy hunting
At the above coordinates, walk around the church and find the year: abcd - then perform calculation:
u=c-a
v=b-d
w=a
x=b-c-a
y=b+a
z=d
Final: N40 59.uvw E09 18.xyz