Our pick for the best online trip planning, mapping, and navigation service. It offers a terrific smartphone app that can be used in the field to access maps and track your trip without needing cellular access. Membership includes a terrfic mapset of aerial imagery, slope angle overlays, snowpack, topo maps, public lands maps, and more. Backed by an active software development group, Gaia GPS is updated continuously and has a bright roadmap for the future of online mapping and navigation services.