This is a bonus cache for the Adventure Lab called ECALT Albany (Erie Canal Adventure Lab Trail). It can be found via the app or using the link https://adventurelab.page.link/7KPM . Some of the locations of that Adeventure Lab will include a numerical value for the letters in the coordinates below:
N 42 4E.RIE
W 73 CA.NAL
Actually, those coordinates are a tad soft (~10 feet) to make the puzzle (and checker) work thematically. There is no place to hide it at the exact coordinates. Go obvious N+0.002 W+.003 to nearest hiding spot. The difficulty rating is for the Adventure Lab; the hidden itself should be simpler.