This is a band plan for three Hand Talkies using the Family Radio Service frequencies and taking advantage of transmission offset and dual monitoring. It is designed to transmit and receive on different frequencies so that others using an FRS radio would only be privy to half of your conversation.
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If they know you are using that chart that you publicly posted then they could listen to the whole conversation?
@shortstories The programmed offsets have the effect that HT1 transmits on HT2 and HT3's primary receive; HT2 tx's on HT1's primary and HT3's secondary rx; and HT3 tx's on both the other HT's secondary rx channel.
@shortstories Yes, it's only security through obscurity, and probably requires some further explanation.
With cheap and common Baofengs, you can monitor two frequencies at once. You set the primary channel on each HT to one of A1 thru A7 and the secondary to the FRS channel that corresponds to the A channel for that HT (shown in the bottom three blocs of the band plan).