OSHI for Hiking — Maps and Messages Beyond the Last Bar

OSHI is a free, open-source, end-to-end encrypted messenger for iOS and Android that uses Bluetooth and Wi-Fi mesh networking to send messages without Internet or cellular service. OSHI does not require a phone number, email address, or account.

On a trail, "no service" is the normal state, not the exception. Two things matter: knowing where you are, and staying in touch with the people you came with. OSHI covers both in one app: downloadable OpenStreetMap maps with routing, and a Bluetooth/Wi-Fi mesh that keeps a group in contact without any signal. This page is honest about the range, because a hiking group is strung out in a way a festival crowd is not.

Offline maps

Before you leave, download the map region for the area. OSHI's maps are OpenStreetMap data with offline search and turn-by-turn routing, and OpenStreetMap is often better than commercial maps for footpaths, huts and springs because hikers draw it. Once downloaded, the map, search and routing work entirely on the phone. GPS does not need a network, so your position shows on the map with no signal at all.

Group messaging on the trail

A hiking group naturally spreads out: fast walkers ahead, photographers behind. OSHI's mesh handles this as long as each person is within Bluetooth range of the next. Rule of thumb from our App Store listing: roughly 100 m apart in the open, much less through trees, rock or bends. Each phone relays for the others (up to five hops), so a group of six spaced 80 m apart can pass "stop at the fork" from front to back. When someone drops out of range, the message waits on the nearest phone and delivers when the gap closes, for example at the next rest stop.

Live location and finding each other

Share live location in the group before you split up. Each person's position rides over the mesh whenever they are in range and shows on the offline map. This is not a satellite tracker: it cannot tell base camp where you are if base camp is 10 km away with no phones in between. It is for the group itself.

Extending range with LoRa

If your group regularly separates by more than a few hundred metres — a climbing party, a scout camp, a valley traverse — OSHI's optional LoRa node extends the mesh by kilometres. Be aware of the limit stated in our listing: messages bridged over the LoRa link are not encrypted by that link. For kilometre-scale text with position sharing and multi-day battery, Meshtastic radios are the specialist tool; see OSHI vs Meshtastic.

Battery on a multi-day trip

• Put the phone in airplane mode and re-enable Bluetooth (and Wi-Fi if you plan to send photos). A phone searching for a tower all day is the biggest drain there is; the mesh is not.
• Keep OSHI open when you want to relay; iOS limits background Bluetooth. Between stops, closing everything and checking at rest points is a fine compromise.
• Photos transfer over Wi-Fi Direct; batch them at camp rather than sending on the move.
• Carry a power bank; cold nights halve a battery.

What OSHI does not replace

A satellite messenger or PLB for real rescue. OSHI reaches the people around you and, when any phone gets a signal, syncs the rest; it does not reach a rescue centre from a ridge with nobody on it. Take a paper map too. If your group has cellular in patches, OSHI will opportunistically deliver queued messages over the Internet the moment one bar appears, which is a real advantage over apps that only work one way.

Alternatives for the trail

OSHI is an alternative to Bridgefy, Briar, Meshtastic and bitchat for offline communication, and to Signal for private messaging. For hikers specifically: Meshtastic for long-range radio text if everyone carries a node; bitchat or Bridgefy for phone-only chat without maps. The best offline messenger page compares them.

Frequently asked questions