Quick Answer
When navigating in snowy terrain, contour lines on a map can help you estimate elevation changes and stay on track. To use them effectively, look for ridges and valleys, which appear as long, gentle curves on the map. This can guide you through whiteout conditions.
Understanding Contour Lines
Contour lines are imaginary lines on a map that connect points of equal elevation. In snowy terrain, they can be used to identify ridges, valleys, and other topographic features. A good rule of thumb is to follow the direction of the contour lines, as they often indicate the direction of the slope. For example, if the contour lines are spaced closely together on a map, it indicates a steep slope.
Reading Contour Lines in Snowy Terrain
In whiteout conditions, look for features that are visible on the map, such as ridges and valleys. These features are often marked by denser contour lines, which indicate a change in elevation. To use this information, look for a contour line that is parallel to the direction you want to travel. This can help you stay on track, even in heavy snow. For example, if you want to travel downhill, look for a contour line that is parallel to the slope and follow it down.
Using Contour Lines with GPS
If you have a GPS device, use it to verify the location and elevation of features you encounter on the map. This can help you stay on track and adjust your route as needed. For example, if you’re following a ridge and your GPS indicates that you’re off course, use the contour lines to identify a nearby valley or other feature that can help you get back on track. Always keep your map and GPS close at hand, and use both tools in conjunction to stay safe in snowy terrain.
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