CalTopo

Users draw routes, add waypoints, and view layers such as slope angle shading and forecast data. Teams can share a live map during an operation. Maps print to scale, and the mobile app supports offline use.

A free tier covers basic planning, and paid tiers add advanced layers, printing, and team features. The interface is dense, and new users usually need a short tutorial.

Gaia GPS and AllTrails are alternatives with friendlier interfaces. CalTopo suits guides, avalanche professionals, and rescue teams.