So... its cool

But why not use use a walkie talkies?

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I ask same. Why not?

Encryption. Lower power consumption. Possibly greater range. Open source.

Very thank you

Walkie talkie is 1 to 1. With meshtastic units you can effectively set up a group chat if you wanted to. You're also using other meshtastic units as a kinda pass through to reach further off units. Hence the idea of a mesh.