Camp Rock Mystery Cache

The posted coordinates for this cache mark one of the locations where the popular movie, Camp Rock was filmed. It is actually a very old boys' camp which has operated on Gull Lake for many years. The name of this camp is NOT Camp Rock. The camp is of course private property, and in finding this cache you do not have to go near private property. The cache container is not at the posted coordinates. Please solve the puzzle below to calculate the corrected coordinates. 

To find the North coords, find the number of years between the camp's opening year, and the first year the camp was visited by John "chief" Latimer. Multiply this number by 10 and divide that answer by 1000. Add the result to the posted North coordinate. 

To find the West coords, find the year that filming of Camp Rock started at the camp and subtract the year that Latimer purchased the camp from Charles F. Plewman. Add 34 to this answer. Divide the result by 1000 and subtract the result from the posted West coordinate. 

If you're like me, after finding this cache you might sneak down the camp's driveway to find the sign pictured on this page. I've embarrassed my daughters several times by bringing them to the sign for photo ops. Lol.