This cache is not at the posted coordinates, and neither location is Otsego Lake. This Township park is closed from 11 pm to 6 am. There are many neighbors who can and probably do watch everything that happens here. Please act accordingly.
Otsego Lake is located in northwest Michigan,south of the city of Gaylord in Otsego County. Otsego Lake State Park is located on the southeast shore of the lake and Otsego County Park is on the northwest shore.
Otsego Lake was the long-time summer residence of Arthur Compton. Compton received the Nobel Prize for physics in 1927 for his work with X-rays and what later became known as the "Compton effect". During World War II, he was a key figure in the Manhattan Project that developed the first nuclear weapons. In the late 1950s, noted American architect and Frank Lloyd Wright protege, William Adair Bernoudy, designed Compton's retirement home on the lake directly across from Otsego Lake State Park.
The posted coordinates will take you to a very cool map of Graham Lake. Take the deepest marked depth of the northern lobe of the lake and subtract that from the marked max depth, and call that D. The coordinates for the final are N 42 13.YYY W 085 11.ZZZ where YYY is D multiplied by 59 and ZZZ is D multiplied by 191.