While off the grid you'll want a good reference to guide you on the Colorado River. RiverMaps 8th Edition of the Colorado River in the Grand Canyon Guide has the most up-to-date data for your trip.

• This guide covers 297 miles of river in 119 pages. Includes 51 maps and all color photos with up-to-date data on camps and river features.
• Spiral-bound format with full-color topographical maps on the right side and complete text descriptions on the facing page.
• With book in hand, maps read from bottom to top to match the downstream flow of the river.
• High-quality waterproof paper prevents ink from smearing and is tear resistant to keep your guide intact throughout your trip.
• Relief shading of the topo map offers a much clearer perspective of the terrain.
• Excellent mile-by-mile information on rapids, campgrounds, geological features, historical sites and reference points.
• The topo maps are the same scale as the original USGS maps. The contour lines and accurate river shape enhances your ability to keep track of where you are.