Highly detailed GPS accurate map of all the fishable waters within the park. Includes trails, fish species, fishing regulations and more. Free Mobile Map works without cell service or internet. Published 2021. Comprehensive coverage: Key rivers like Yellowstone, Lamar, Firehole, Gibbon, Madison, and more Well-marked access points, trails, and river distances Backcountry-ready with campsites, trailheads, and access to remote streams Regulations and species info for responsible fishing Insights into water types, structure, and prime fishing spots