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Misty Blue · 07-28-2004, 05:49 PM

I have seen these things before and have been told that they are markers for the US Geological Survey and are photographed by planes for topographical mapping. Just what I have heard, I'm more of a chart guy than a map guy.

Misty Blue

07-28-2004, 05:49 PM	#11
Misty Blue Senior Member Join Date: Jul 2004 Posts: 658 Thanks: 121 Thanked 283 Times in 98 Posts	White thing I have seen these things before and have been told that they are markers for the US Geological Survey and are photographed by planes for topographical mapping. Just what I have heard, I'm more of a chart guy than a map guy. Misty Blue