# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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FW: UTM to geod. lat/lon conversion
From: Doug Royer
Date: 2003 Dec 11, 15:20 -0800

```Let's try this again with the correct address.

-----Original Message-----
From: Royer, Doug
Sent: Thursday, December 11, 2003 15:19
Subject: RE: UTM to geod. lat/lon conversion

A while ago we had discussions of mil compasses and measurements etc.In one
of those posts I wrote of useing 10 digit northing and easting coordinates,a
UTM grid,a UTM measuring rule and 2 formuli for insertion and resection to
another point on the grid.I consistantly get position readings within 1
meter of the GPS pos on both the base and insertion/resection points useing
the method.The rules,capable of measurements and or conversions in multiple
coordinate datums,can be bought in the states for \$25.00 at high end
outdoors stores such as REI or A16.I will get the name brand of them and
post for those interested.The formuli I will look for when I get home and
post also.There are also formuli to convert the UTM coordinates to lat/lon
and visa-versa I use in my palm pilot and those will also be
posted.However,I've noticed the accuracy of the pilot program or formuli
isn't as accurate as the rule method.Probebly because they only use 8 digit
coordinates.

-----Original Message-----
Sent: Thursday, December 11, 2003 14:42
Subject: Re: UTM to geod. lat/lon conversion

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.

The need to still go out and reference the corners of a UTM grid to a
"better reality" would seem to make it suited only to jobs where the same
one local patch is going to be referenced again and again, like an artillery
controller would.

No?

```
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