UMU - Unusual Measurement Units. The smoot is the height of MIT student Oliver R. Smoot as defined in 1958 on Harvard Bridge. It is 5 feet 7 inches (67 inches or 1.7 meters). You can read the story here: https://en.wikipedia.org/wiki/Smoot I think it is great fun that he went on to be chairman of the American National Standards Institute. He was very involved with measurement and standardization.
This cache is in State Gamelands. Wear orange as needed and respect hunters.
The cache is not at the posted coordinates which are near parking. Instead, you must project the correct location from the posted coordinates. Assume a unit circle of 1 smoot radius. The distance around the arc is 3 smoots which makes the angle 3 radians (radians, not radius). Cache is 100 smoots away and 1 smoot high in the tree. It is a black bison tube - purple duct tape envelope. Bring your own pen. No, there is no checker. If need be, ask the CO for confirmation.
This might be an interesting book about measurement for kids ... Me and the Measure of Things
Congratulations to NoBlueCircles on the first-to-find.