Where we ride, the signal ends a few minutes past the staging area. We built the app for that. Here is what keeps working once it does, what does not, and what we do in the last kilometre of coverage.
See where the signal ends
Turn on the Cell Signal layer. It shades estimated outdoor coverage for the United States and Canada, from strong to none, and says Not modelled here elsewhere. Tap a spot for Cell signal here and the nearest usable signal with its direction and distance. It is an estimate for any carrier, not a promise, but it tells you roughly where the phone stops being a phone.
A planned route gets a signal profile: where the last signal is, the longest gap and the share of the route with coverage. On the way, the app nudges you when you are about to lose signal and offers to send your location to your friends before it goes. With a radio connected, the nudge reminds you that messages will still go out over the mesh.
Download the area before you leave
Open Offline Maps, frame the terrain and confirm. The app lists the layers and the estimated size first. Every map layer can come: the basemap with its places, satellite, topo contours, slope angle, cell signal, snow depth and the weather layers. Recent Satellite and forest loss come too on Pro. Each area ships with a routing pack and an offline places pack.
Every map layer downloads. Satellite saves at a lower detail ceiling than it shows online. Weather, fire and smoke, and snow depth save as the data available when you download and age after that, and the app marks them Outdated so you know to refresh. One offline region is free and Pro removes the limit. You can also plan an area from the web app, and it shows up on your phone ready to download. A region shows the date it was downloaded and can be refreshed when the snow data is outdated.
Navigate on the phone alone
Routing in Aventerra runs on the phone. The router works over the trail graph in your downloaded area for six profiles: foot, bike, car, snowmobile, quad and dirt bike. It gives you turn cards, an off-route banner and haptics. There is no voice guidance.
The route builder works the same way. It builds routes on the device from the trails around the map centre, so it works offline once the area is downloaded. The only part that needs a connection is the Ask tab, where you describe the outing in words. Routing works where the routing graph is published, and the app says so when you move the map outside coverage.
Recording keeps working too, because positions come from the phone's own location service. Replay the track in 3D when you are back. The companion watch app shows a breadcrumb and back-to-start from your wrist.
Search and read the terrain without a connection
Search still answers offline. Places from your downloaded packs and the global places bundle are on the phone, and your saved routes, tracks and waypoints are always there. Type coordinates in any common format, including UTM and MGRS, and the app recognises them itself. Peaks, lakes and huts inside a downloaded area are in your pack too. Outside your downloaded areas, backcountry features wait for a connection. The app says Offline, showing saved areas only when that is the case.
Tap the ground and Terrain here computes the slope on the device from the elevation model in your downloaded area. If you tap outside it, the sheet tells you to download the area to get slope angles offline. Snow depth is the picture from the day you downloaded or refreshed. Trip ideas in Explore fall back to local suggestions only.
Stay in touch with a radio
With a Meshtastic radio paired, the group's positions, chat, waypoints, community reports and SOS travel over the mesh. Mesh chat is end-to-end encrypted. Internet chat is not. The phone picks whichever path is reaching you, so when cell comes back the internet takes over without you doing anything.
Without a radio, an SOS sent with no signal waits and goes out when you reconnect, and the app tells you that. In both cases SOS reaches other app users, not emergency services. For a life-threatening emergency, use your phone's own Emergency SOS or a dedicated satellite communicator. The mesh setup guide covers pairing a radio.
What stays online
Live weather updates, the Ask tab of the route builder and the point forecast are online only, and so is searching for backcountry features outside your downloaded areas. Nothing offline lives in the web app, which has no downloads, no mesh, no recording and no SOS.
Our habit is to download the area at home on wifi, read the terrain over satellite while we still can, and send a test chat over the radios in the parking lot with the phones in airplane mode. After that the phone only needs its own GPS.
Which layers download, where the routing packs come from and how regions are counted on Free and Pro are on the Offline maps page.