X Y coordinates
I had to take a little different route come up with my answer. I went to
http://www.mdwfp.com/level2/Wildlife/Game/GIS/default.aspSelected Wildlife Maps
I picked the map for the Choctaw WMA.
http://www.mdwfp.com/Level2/Wildlife/Game/GIS/pdf/1321.pdfI then increased the size of the map to 100% so I could read the LAT/LONG coordinates across the top and edges.
NASA seems to know a little about navigation.
http://www-istp.gsfc.nasa.gov/stargaze/Scelcoor.htmIn the case of the Choctaw WMA map I will look at Ackerman. The (Y) coordinate is 33° 18’30”N, the (X) coordinate is 89°10’30”W.
Hopefully I came close to answering to question. I make no claims about being an expert. I am sure our members who are surveyors can come up with a cleaner, classroom answer.
At one time I carried an “L” shape ruler around with me to square the X Y coordinates. Admittedly I did not know it as X and Y.
At times you make adjustments. In one for instance I needed the assistance of a helicopter. I had given the dispatcher my location using Township, Range, and Section, ¼ section. When the helicopter become airborne I provided the pilot with my LAT/LONG. This was before handheld gps units were common in the field and aircraft were using Loran for navigation. Unlike the example above my location did not fall at the confluence of the 30” mark. I eye balled my location and then modified it a little. Instead of a 30”, I made it a 05” on the X and a 15” on the Y.
33°18’15”N (Y)
89°10’05”W (X)
The pilot found us based on the information provided. I was up high at about 5500-foot elevation and I could see a long distance. The helicopter was coming from about fifty miles away. I picked him up about 20-30 miles out and he was a dark dot in the sky making a beeline for our location.
http://www.maptools.com/UsingLatLon/Formats.htmlP.S. I like the site you provided.
