Flipperfla
Sr. Member
Since we are on subject what does BM then 4 numbers mean? Boundary Marker then the marker number?
Looks like the 5684 is the elevation since the contour lines downslope show 5000 and 4500.I’d guess in your instance, it’s likely referring to “Bench Mark” the numbers either being the elevation, or the name of the survey monument.
View attachment 1880139
In this case it’s a triangulation survey marker located at the top of a mountain.