Therefore, from 48 to 56 degrees north (southern BC and Alberta) are in latitude U. Eg -50 latitude is 6 less than 'M', less one more. Therefore letter for 49 is "U", all the way up to 56 degrees north.įor negative latitudes (south of equator), move down the alphabet, starting at 'M'. Eg: The zone letter for latitude 49 is integer 6, plus 1. If latitude is less than 0, they start at letter "N", and count forward one letter for every 8 degrees, plus one more letter. Eg: Zone 10 is between 126 and 120.Ĭorrespondance between Longitudes and Zonesĭegrees: 180 174 168 162 156 150 144 138 132 126 120 114įor a diagram showing how the zone boundaries overlay on top of the lower 48 states see: UTM Zone Boundaries across USA Below is a crude diagram showing how the zones correspond to longitudes. The next zone east is zone 11, which covers the Canadian Rockies. The zone numbers run from 0 to 60, starting at 180 degrees longitude (East Siberia, and running EAST so by the time you count down to 123 degrees for Vancouver, you are in zone 10 (120-126 degrees West). In the zone identifier such as 10U, the number corresponds to longitude and the letter to latitude. Each zone is 6 degrees of longitude wide and 8 degrees of latitude tall. The zones are world wide, and any given grid reference is relative to the middle of the zone. For mountaineering, the most convenient thing is to configure your GPS to read out your position in UTM co-ordinates, rather than latitude and longitude.īoth in GPS and on maps you will see references to UTM Zones, such as zone "10U" for Vancouver. I'm assuming you've seen the blue grid lines on a 1:50,000 map, each of which is 1 km apart (2 cm). The grid lines are much more convenient than latitude-longitude, because they are straight on any given map, and the notation doesn't involve minutes and seconds. It is a system of projecting rectangular grid lines onto maps. UTM means "Universal Transverse Mercator". My aim in the article below is to describe the theory of the UTM system and how the whole system works. Written: 2000.05.04 by: Robin Tivy Type: Reference UTM Zones and the UTM System Home Help Index SignUp Login
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