Send text messages and share GPS locations on offline maps with others. Chat privately in 1-to-1 or group conversations, or broadcast to any other goTenna Mesh device up to several miles or kilometres away all without using towers, routers or satellites.
Each device is powered by networking protocols which intelligently — and privately — relay messages through other users. You can potentially double or triple any device’s effective range and create a network that gets stronger the more people join it.
https://www.youtube.com/watch?v=183891680