I located an unknow marker on Mackinac Island this past weekend and am unable to determine who placed it, or what the marker is trying to convey. The marker is located at a scenic overlook to view Sugar Loaf; of course I failed to collect exact coordinates.
The markers reads as follows:
B.M.
Sea Level
EL=873.93 FT.
BOVI IA 1293
BOVI Sugar
Loaf 18 Ft.
Underlined characters could be the letters L or I, or the number 1