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I'm pretty sure that the FCC would tell you that you need to identify on each and every channel that you're transmitting on. That's kind of the whole concept of ID'ing - it's a way to identify who is transmitting, so that any issues of interference can be more easily resolved. If you transmit on channels 1,3,5, and 7 - but only transmit a partial ID on Channel 5 and 7 (because the radio switched channels halfway through your voice identification) then I don't think you've properly identified. How does the radio accomplish monitoring the channel to make sure it's open and available before automatically switching?

Spread spectrum is not permitted on GMRS. This feature is a crude poor-man’s variant of that. I would venture to guess that the only logical legal conclusion would be that identification rules apply to each frequency of operation, no different than if you manually switch channels and keyed up. Just like it would not be legal to hold two radios, one tuned to channel 1 and one tuned to channel 2 and announce yourself only on channel 1 every 15 minutes but then do your talking on channel 2 but never announce yourself there. Michael WRHS965 KE8PLM

I wonder if anyone has pointed that out to the FCC? Seems that an automated frequency hopping system in GMRS would not be monitoring the channel prior to each transmission as it hops around - potentially causing interference to anyone who is already transmitting on the channel. I'd also wonder how it handles identification on the 4 channels that it just transmitted on. Or, do you need to stop every 15 minutes to go back and manually key up on the channel(s) in question and properly identify? Type acceptance under Part 95 probably doesn't allow for such a feature. I'm not a lawyer.

A determined harasser/jammer can easily find out that you're on separate frequencies - and yet still - they need only transmit on just one of them to break your stride. There just aren't that many GMRS frequencies. Now, if it's simply a matter of avoiding hearing somebody else's objectional and uninvited comments - PL tones, or even better, DCS codes work quite well. Remember - nothing can stop someone from transmitting on (any) channel - but you can filter them out - easily. It's exponentially way more work for them to flip through codes and tones than it is channels. Filtering is the purpose of PL and DCS - it only opens squelch when it sees a signal with the code you have programmed in. Really, hearing an unintended party is only an issue if you have no PL or DCS set for a channel. (...and this is why repeaters use PL tones....) Now it may be that you initiate a call on a channel for which you have no squelch code programmed (and third parties can talk on and you hear them too) - but you can easily switch to another channel for which you do have programmed on both radios same squelch code - obviating the need for a split operation.