My Icom IC-F21GM from 2004 has GMRS in what I think of as their natural channel assignments, whereas most radios now follow an FRS-centric numbering pattern. For instance, if your “17” is 462.6MHz, that shows up on 3 on my IC-F21GM. The high-powered GMRS frequencies are first, then come the 7 lower-powered (5w max) follow. So, if your “4” is 462.6375MHz (which, to me, should be akin to CB19 as it is the middle frequency on the band), that would show up as “12” on my ’GM. Plus, that radio has a button to switch the repeater channels to simplex mode whereas on a midland, the repeater channels come after the simplex channels (15 vs. 15RP, for example). This is why the frequency makes more sense to use, & I wish displays would give the frequency instead of the channel. I have another radio that is a commercial radio that has everything mixed together, so “600” (462.6 MHz) may precede a repeater on “550” (462.55 MHz). I’ll usually label it by city: “600” becomes “Kingston”, and “700” becomes “Plymouth”. Anyway, the FRS-centric channel numbering is confusing because it is non-intuitive, unless you’re using a strictly FRS radio. IC-F21GM channeling: 1: 462.55+ 2: 462.575+ 3: 462.6+ 4: 462.625+ 5: 462.65+ 6: 462.675+ 7: 462.7+ 8: 462.725+ 9: 462.5625 10: 462.5875 11: 462.6125 12: 462.6375 13: 462.6625 14: 462.6875 15: 462.7125 16: scan.