![]() If you live around the Great Salt Lake, then you would add 15 degrees going from the map to the compass, or subtract 15 degrees going from the compass to the map. To achieve this, the deviation between the Norths can be found on USGS maps in the margin, or by using this diagram: I like to shoot an azimuth with the compass, and use the same degrees on the map without the hassle of converting magnetic North to true North and back. Google Maps is oriented to true North, so the top of the image is perfectly aligned to the geographic North Pole, unlike grid North which is aligned to the Prime Meridian. The second part is to add azmuthal projections (arbitrary grid lines) to the map for accurate use with a protractor. Printing the map in the desired dimensions can be a challenge because of the way the Google Maps interface functions. A closer zoom generates more isoline detail with the respective elevations. Start by selecting “Terrain” to get a topographical display in Google Maps, and print the picture. ![]() Orienteering map made from a Google Maps image
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