PeakNav

PeakNav drapes satellite imagery, OpenStreetMap trails and place names over a real elevation model of the whole planet. Fly over any range, tap a summit to orbit it, point your phone at the horizon to name the peaks in front of you, or open a photo and have it tagged with the mountains it shows. GPX tracks replay in 3D with their height profile, a walking route can be computed to any point, and ski runs and lifts are painted on the slopes. The sun, moon and stars are drawn where they really are for your location and time. Terrain and map data download per area and stay on the device, so the app works offline. Free, open source (GPL v3), one codebase for Android, iOS, Windows, macOS and Linux, plus a Python package to read elevations or drive the renderer.