CalTopo

CalTopo now supports offline use with satellite data, so you can bring satellite imagery into the field even when you lose service. You download the areas and layers you need ahead of time, then continue viewing key map details offline—ideal for remote trails, alpine routes, and extended backcountry trips.

A Backcountry Mapping App Trusted by Pros

The CalTopo Android app gives you a powerful navigation and planning toolkit that professional mountain guides, avalanche educators, and search-and-rescue teams rely on. You can plan routes with the same map layers and terrain tools used in real-world decision making, then carry that plan into the field on your phone.

Seamless Sync Between Web and Mobile

CalTopo connects your mobile app with CalTopo online so your maps stay current everywhere. When you update a route, add a marker, or adjust a layer on one device, CalTopo syncs changes automatically across your devices. You stop wasting time exporting and importing map files just to keep everyone on the latest version.

Offline Navigation and Terrain-Aware Decisions

CalTopo helps you navigate off-grid by letting you download maps and critical layers for offline use, including terrain tools like slope angle shading. You can also plan around conditions by checking layers that support route awareness, such as sun exposure, wind, precipitation, and avalanche forecast information—useful when you want to choose safer lines and better timing.

GPS Tracking and Field Use (Even Without Service)

CalTopo shows and tracks your position on the map using your phone’s GPS. Because the app works offline with downloaded data, you can keep navigating when coverage disappears. This setup supports real-time decisions in the field instead of forcing you to rely on memory or paper backups alone.

Team Sharing and Live Tracking

CalTopo makes group trips easier by letting you share maps with partners or teams so everyone sees the same plan and the same downloaded information. With shared maps and live tracking, you can also monitor real-time progress from the field—especially helpful on long routes, multi-group outings, or coordinated operations.

Map Layers and Data You Can Add

CalTopo includes a wide range of layers for planning and navigation, including:

• MapBuilder Topo, Hybrid, and Overlay
• Forest Service maps and scanned topos
• Global imagery and shaded relief
• Slope angle shading (with high-resolution elevation data where available)
• Parcel data, public lands, and marine charts
• Weekly satellite imagery and NAIP satellite imagery
• Sun exposure
• Weather forecasting (wind, precipitation, temperatures)
• Snow and water gauge data
• Fire history and activity
• And many additional layers depending on region and availability

Get Ready for Your Next Off-Grid Trip

Use CalTopo to plan your route, download the right layers, and navigate with confidence anywhere your adventures take you. The app keeps your maps synced, supports offline satellite-ready use, and gives you tools built for serious backcountry travel.