Quick Answer
A survivalist chooses topographic maps over digital maps because they provide a more reliable and detailed representation of the terrain, essential for navigation and route planning in wilderness areas. Topographic maps are less susceptible to signal loss or battery drain, and their paper format makes them easier to use in harsh environments. They also allow for visual analysis of contours and landforms.
Understanding Contours
Topographic maps use a system of contours to represent the three-dimensional landscape on a two-dimensional surface. Contours are imaginary lines that connect points of equal elevation, allowing the user to visualize the shape and slope of the terrain. By studying contours, the survivalist can identify key features such as ridges, valleys, and water sources, as well as potential hazards like steep slopes and fast-moving streams. A contour interval of 20-30 feet (6-9 meters) is common for wilderness areas, but some maps may have intervals as small as 10 feet (3 meters) for more detailed topography.
Reading Contours for Navigation
To read contours effectively, the survivalist should focus on the following techniques:
- Identifying the direction of slope by noting the direction of contour lines: lines that are closer together indicate steeper slopes, while lines that are farther apart indicate gentler slopes.
- Locating high and low points: the highest point on a map is indicated by a series of contour lines that converge, while the lowest point is marked by a single contour line.
- Using contours to estimate elevation gain and loss: by measuring the distance between contours, the survivalist can estimate the amount of elevation gain or loss required to traverse a particular route.
Using Contours for Route Planning
When planning a route, the survivalist should use contours to identify the most practical and safest route. By studying the contour pattern, the survivalist can choose a route that minimizes elevation gain and loss, avoids steep slopes and fast-moving streams, and stays within a reasonable distance from water sources. In areas with dense vegetation or complex terrain, contours can help the survivalist identify potential obstacles and route around them. By combining contour analysis with other map-reading techniques, the survivalist can develop a detailed and effective plan for navigating the wilderness.
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