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UTM?

 
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  #8  
Old 06-08-2014, 02:04 AM
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Join Date: Sep 2011
Location: Los Lunas, NM
Posts: 127
Re: UTM?

Maybe I am not doing this right but here is what I did with my Rino. My map on the Arizona/New Mexico border has a Grid Zone designation of 12S, 100,000-m Squares: XC. So under setup and units I have the Us National Grid as Position Format and NAD 83 as the Map Datum which is the same as the map.

So there is a grave marked on the map I want to go check out, sorry I am morbid and love the old west since I live here. I love old mines, ghost towns and graves and homesteads. So the location is 12S XC 82400/35000 in the Rino. I guess if I had to put 7 numbers in it would be 0682400/3735000. I would have to put the zero in front of the 6 as on the map it is 682400.

Now with 12S XC 82400/35000 I put that on Topo 2008 and can see I am really close to where the map says the grave should be. I can probably get closer with an actual tool to measure as I estimated the last 3 numbers for both positions. I plan on scouting here in the next couple of weeks so will tell you how close I am.
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  #9  
Old 06-17-2014, 12:58 AM
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Join Date: May 2009
Location: Australia
Posts: 733
Re: UTM?

The situation on the topo map is the same in the US . I thought it would be.
The situation inside a GPS may vary as to how it handles a shortened grid reference number .
Some may shorten the number from the right which will make it the right number with less precision . However I would have thought that your second reference number of 35000 could not be right if you enter it as 3735000 instead , as you stated .
To reference 35000 meters I would enter 0035000 . Although the US National grid is based on the UTM system I would tend to use UTM setting in the GPS if you have taken a grid reference from a UTM grid based map and enter the same datum that is on the map . Then the GPS will convert it and navigate using WGS84 the datum in the satellites but read out you position data to suit the map datum .
National Grid is more like the Military grid system MGRS as far as I can tell , I could be wrong .
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  #10  
Old 06-17-2014, 07:11 PM
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Join Date: Sep 2011
Location: Los Lunas, NM
Posts: 127
Re: UTM?

I am so confused right now. I went to MyTopo and ordered a map instead of buying four maps since I usually hunt where two or more topo maps come together. Here is what the legend on the bottom of the map says. In black it says Universal Transverse Mecator (UTM) projection zone 12. The line under that also in black says North American Datum of 1983 (NAD83). Under that in blue it says 1000 meter UTM / USNG / MGRS. The next line in blue says Grid Zone Designation: 12S . The final line in blue says 100,000-m Squares XC

Using the USNG with the 12S and XC put in I only have to enter the last five numbers. If I change the GPS to UTM UPS for that grave site it changes to 12 S 0682400 over 3735000. The MGRS and USNG have the same location designation. Either way I get to the same place it just depends on what information I have to put in.
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  #11  
Old 07-07-2014, 10:11 PM
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Join Date: May 2009
Location: Australia
Posts: 733
Re: UTM?

That sounds right to me , quoting the XC when using USNG just takes the place of quoting the actual full numbers .
It's the same reference . Why map makers want to reinvent the wheel amazes me . My advice is use NAD83 datum UTM / UPS setting and the full reference 12 S 0682400 over 3735000 . that way it's the same system all over the World and you can navigate with that grid system anyplace on the planet.
The UPS stand for Universal Polar Sterographic which is a special grid for polar regions . The USNG and MGRS systems are supposed to be quicker and to reduce reference mistakes , like referencing the wrong grid square .
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