The National Search and Rescue Committee (which includes AFRCC and FEMA) has also adopted USNG for ground coordinates on incidents in which the feds are activated. The USGS is printing new maps with USNG grids. The differences between the datums is 2 meters or less, so unless you're a surveyor, USNG and MGRS can be considered interchangeable coordinate systems.įGDC adopted the US National Grid (USNG) as the civilian grid standard in 2001, which most people, even those in the federal and civilian geospatial industry, didn't realize. MGRS and USNG are functionally identical with the difference being that MGRS is based on the WGS84 datum and USNG is based on the NAD83 datum.
MapTools and the Federal Geographic Data Committee (FGDC) which is the government committee that establishes geospatial standards for civilian federal agencies. You can get free grid overlays for 1:24k (which include the 1:25k and 1:50k scales, too) and print them on acetate. UTM, US National Grid and MGRS 1000 meter grids are identical. The 1:24k USGS maps that cover Oswego County have UTM grid tic marks on them. If the -12 does, you could use the much easier to obtain USGS maps. I don't have a GTA 05-02-12, but I have a GTA 05-02-10 which includes 1:25k scales. Those don't cover Oswego County, but they would be close. Much of the Adirondacks are covered by USGS 1:25k (not 1:24k) topo maps. You might think about using the USGS maps. I suspect most of the non-military agencies you'll work with don't use the 1:50k military scale maps, but the more common USGS maps.
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