What GMRS freqs are these? Note that there is no formal GMRS/FRS channel numbering in Part 95. Individual manufacturers may number the GMRS/FRS channels differently. Many but not all manufacturers have followed Motorola's lead with channel numbering in the 22 channel Motorola Talkabout bubble packs. I've dealt with GMRS-specific handhelds which had 462.575, 462.625, and 462.675 numbered as channels 8, 9, and 10 respectively. In the Motorola Talkabouts, these are channels 16, 18, and 20. It's best to always refer to the specific frequency instead of channel numbers.
I routinely scan the GMRS/FRS and MURS channels in my travels. I have heard a little bit of P25 a couple of times. You never know what you might find next.
