http://en.wikipedia.org/wiki/Topographic_map
The Topographic map is a large scale map that is characterized by the contour lines that appears on the map. These contours lines represents different elevation levels throughout the region covered. They are lines that are connected but dont intersect. It can be used for water depth as well. This can be used on GPS devices used by fisherman to determine a safe route to navigate their vessel as to not run up on shallow water.
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