Try and find the NGS Benchmark located near the Clinch Park Zoo in Traverse City.
The listed altitude of this Benchmark is 586.3 feet. Today the elevation on my Garmin GPS 12 showed 641'.
If you have access to a digital camera or a scanner please attach a photo of your GPS unit next to the benchmark, when you log your find. Also, please include the coordinates and elevation that you came up with in your log.
NOTE: There was a zoo in the area when this cache was placed. The zoo has since been demolished and the animals removed. Also, in 2012, work was done in the area and the original benchmark was moved and replaced. The coordinates above reflect this change.