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    Re: UTM to geod. lat/lon conversion
    From: Casey McMullen
    Date: 2003 Dec 11, 15:46 -0800

    I learned UTM in Search and Rescue Team training for Santa Clara County, CA.  
    Not that I remember it very well, but I still have the little plastic UTM 
    grid square that you lay on your map to subdivide down to 1/10's.  I believe 
    we used UTM for the same reason, a simpler set of numbers to read off/copy 
    down over the radio.  Also, being metric made it easier to do simple 
    calculations with.  Again, this would generally be mostly used for a small 
    area within the same zone.
    Another electronic way to transfer between UTM/latlon that I used to use was 
    to plug a waypoint into my handheld GPS in one format, then change the device 
    option to display in the other format.
    > My understanding (from someone in the US Army) was that UTM's
    > only real purpose was for things like calling in artillery.
    > Two corners of the UTM grid are matched up to more
    > complicated mapping (lat/lon, dd/mm/ss, whatever) and whoever
    > is killing things can deal with simple addition and
    > subtraction on the UTM grid to make their job faster and
    > simpler. And safer, to prevent friendly fire incidents.

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