[time-nuts] Slightly OT - GPS-Based Accurate Direction Finding

gonzo . cadbloke at hotmail.com
Fri Aug 27 12:50:54 UTC 2010


All the fire towers I've been in have a plumb line in the centre of the room and circular graduated ring above window height.
When the spotter sees something of interest, all (s)he has to do is stand behind the string and make a report.

ian

 		 	   		  


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