Meshtastic is an open source project that uses a low power, long range radio protocol to send text messages and telemetry.
Practically, this means that you can get 100+ km line of sight, and a weeks runtime out of an 18650 battery.
Caves
Practically, this means that you can get 100+ km line of sight, and a weeks runtime out of an 18650 battery.
Caves
The current cave communication systems are hard to source, voice only, and tie you to the line. We're looking to change that.
Paragliding
Paragliding is the perfect usecase for this system - you get clear line of sight, there are many other pilots that can act as repeaters, particularly for the first hop to get out of valleys.