How to use maps offline — no data connection needed

Signal disappears at exactly the wrong moment — mid-hike when you need to check a trail, in a tunnel when you miss a turn, in a remote area where cell coverage simply doesn't exist. Having some form of offline maps capability isn't a niche feature; for anyone who spends time outdoors or travels beyond major cities, it is essential. Here's how offline maps work, what's possible in a browser versus a dedicated app, and what to do before you lose signal.

The two layers of a map app

To understand offline maps, it helps to separate the two things a map app does:

• Map tiles — the visual map image you see (roads, terrain, satellite imagery). These are downloaded from a tile server on demand as you pan and zoom.
• Your location and saved places — GPS coordinates from your device hardware and your saved pins, routes, and notes.

Your GPS hardware works with no internet connection at all. The satellites it communicates with are overhead regardless of whether you have signal. The map tiles are what require an internet connection to fetch fresh. So a device with no signal can still tell you your exact coordinates — it just can't draw the detailed map around you unless those tiles were already cached or downloaded.

What works offline in My Location

My Location is a Progressive Web App (PWA), which means it caches its core assets when you first load it on a connected network. If you lose signal later, the app interface itself still loads, your saved places and routes are readable, and your GPS coordinates still update in real time. If you've already viewed a map area while connected, some of those tiles may still be in the browser cache.

What won't work offline without pre-caching: fresh map tiles for areas you haven't viewed, address lookups (turning coordinates into a street name requires a network request to a geocoding service), and live location sharing. For a pure "what are my GPS coordinates right now" use case, though, the app works with no connection.

How to save places before you lose signal

The practical offline preparation routine is: save your key waypoints while you still have signal.

• Open the map area you'll be navigating while connected — this loads the tiles into cache.
• Drop pins on trailheads, campsites, parking areas, and any other reference points.
• Give each pin a clear name and any notes you'll need ("creek crossing, wade at the narrow section").
• Export a GPX or KML file — this gives you a backup that works in dedicated offline navigation apps. See GPX, KML, and GeoJSON explained for the format differences.

Your saved places are stored in your browser's local storage, meaning they survive closing the tab and reopening the app — they're there next time without a connection. Learn more about managing your collection in saving and organizing favorite places.

When to use a dedicated offline navigation app

For serious backcountry use — multi-day hikes, remote off-road driving, sailing — a dedicated offline navigation app with pre-downloaded regional maps is the right tool. Apps like OsmAnd, Maps.me, or Gaia GPS let you download an entire country or region's map tiles in advance and navigate with full turn-by-turn capability with no connection at all.

The workflow with My Location complements this: plan your route and save waypoints in My Location while connected (the web-based map is fast for planning and research), export them as a GPX file, and import that GPX into your offline navigation app before you leave. Your saved pins and route travel with you.

GPS accuracy with no signal

One common misconception: losing cellular signal does not reduce GPS accuracy. Your device's GPS chip communicates with satellites directly via radio, independently of your mobile data connection. The two are completely separate systems. You can have perfect GPS accuracy in a location with zero bars of signal — the coordinates you see are just as precise as they would be in the city. For the full picture on how accuracy works, see how accurate phone GPS really is.

Prepare before you go

The golden rule of offline navigation: do your preparation while connected. Load the map, save your waypoints, export your files, and test the app loads. Then you can head out knowing that if the signal drops, you've got your coordinates, your saved places, and a file you can open in any navigation app. Open the map and start saving your waypoints.