This is a two stage multi-cache. There is no physical container at the first stage. The first stage will bring you to the ruins of the original Providence Bay lighthouse, which stood here from its construction in 1904 until it was struck by lightning and burned to the ground in 1974. You will need to do some simple math at the first stage, which will give you the coordinates to the final. Its a nice long walk along the shoreline between the stages, and i encourage you to stop and enjoy the scenery of Lake Huron's rocky shoreline.
To recieve the final coordinates:
At the posted coordinates you should see the ruins of the old lighthouse, you should see some metal posts sticking up around the ruins
take the amount of metal posts and multiply by 136
this number will be A
Look around at the base of the new light tower, you should see a benchmark in the concrete, you should see a year on this benchmark
subtract 1918 from that year
this number will be B
N 45° 38.AAA W 082° 16.0BB