Stay connected even when you're "off the grid"

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What about if there is no one else using Sonnet around me ? It doesn't work ? And can I use my own apps to communicate or do I have to use the Sonnet app ?
If the only point of this is to be able to communicate with other users who have the same device and are in a 5Km range... I don't really see any point to it, unless you are doing some kind of organised outdoors activity with a big group of people.
Send text messages, voice recordings, images, and GPS locations on your phone without cellular coverage, satellite, or Internet access.
A CB network for 2017. Really useful for missionaries in the middle of no where. Thank you. Also how can this be used to track people not wanting to be found?...