Offline Topo Map

The topographic map that works where the signal doesn't.

Offline Topo Map brings OpenTopoMap, the free topographic rendering of OpenStreetMap data, to your iPhone and iPad. Contour lines, hill shading, peaks, huts and trails, exactly as thousands of hikers already use them in the browser. Then it lets you take the mountains with you: draw a rectangle over the area you are heading into, download every zoom level, and the map keeps working when your phone has no connection at all.

WHAT YOU GET

• Real topography — contour lines, shaded relief, summits, passes, huts, springs and marked trails from OpenStreetMap and SRTM elevation data.
• Draw it, download it — tap the dashed rectangle, drag across the map, touch and hold to nudge it into place, then download zoom levels 0 to 17 in one go.
• Know the size first — before anything is fetched you see the tile count and an estimated download size, so a careless swipe never turns into a gigabyte.
• The offline switch — flip it and the map shows only what you have stored, with every saved area outlined. What you see is exactly what you will have on the mountain.
• Downloads that finish — lock the phone or lose the connection and nothing is lost. Every area remembers what it is missing, and one tap fetches only the rest.
• Find yourself — one tap centres the map on your position. Location is used on the device only.
• Your storage, your rules — a downloads list shows each area with its size and date. Delete one, delete all, or jump straight to it on the map.

BUILT FOR THE OUTDOORS

Plan at home on a big screen, then navigate on the trail, on a ski tour or a bikepacking trip in valleys with one bar of signal or none. The app never sends anything but map tile requests, has no account, no ads and no tracking, and collects no personal data.

BUILT ON OPEN DATA

Map style © OpenTopoMap (CC-BY-SA), map data © OpenStreetMap contributors and SRTM. Offline Topo Map is an independent client and is not affiliated with the OpenTopoMap project or the OpenStreetMap Foundation. To keep the volunteer-run tile service healthy, each download is capped at 15,000 tiles and the app backs off whenever the server asks it to.

A NOTE ON SAFETY

Map data comes from volunteers and satellite elevation models and can be incomplete or outdated. Use the map as an aid alongside an official topographic map and your own judgement, never as your only means of navigation in terrain where getting lost is dangerous.

Questions or ideas? Visit offlinetopomap.com.