this just a bunch of identical maps of the same location you can view in numerous mapping programs. I believe the mark to be a ramp location. You can click on google maps and see the topo or click on google satellite and see the satellite view of the lake. Or you can use GPS visualizer and use the draw map feature. Some people prefer different map viewing programs over others, so I guess this is about sharing mapping of the same area with various mappers.
Geocatching is all about points on the map. Kinda like the red teardrops on any googled up location.
I like using google earth (satellite view) for overlaying and calibrating my own maps. It is pretty easy to do.


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