Quick Answer
For river navigation, topographic maps from the USGS with a 1:24,000 scale are ideal for showing detailed river features, while the US Coast Guard's charts are better suited for large bodies of water and major navigable rivers. The NOAA's RNC (Raster Navigational Charts) also offer detailed river and coastal maps.
Choosing the Right River Map
When selecting a river map, consider the scale and detail level. Topographic maps from the USGS, such as the 7.5-minute series, provide detailed information on river features, including depth, current speed, and hazard areas. These maps are ideal for smaller rivers and streams. For larger bodies of water and major navigable rivers, US Coast Guard charts are a better choice.
Understanding River Map Symbols
River maps use a variety of symbols to convey important information. Familiarize yourself with these symbols, such as the “No Wake” zone or the “Current” symbol, to ensure safe navigation. Pay attention to depth soundings, which are crucial for avoiding shallow waters and running aground. Look for symbols indicating hazards, such as “Shoal” or “Rocky Bottom”.
Using River Maps for Downstream Navigation
When navigating downstream, use your map to identify potential hazards, such as waterfalls, rapids, and shallow areas. Pay attention to the river’s width and depth, as well as any changes in elevation or direction. Use your map to plan your route and identify potential take-out points or campsites. Always carry a spare map and compass, and know how to use them in case of an emergency.
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