speedkills previously posted:
"I’m not sure which channels are repeater channels for frs/gmrs but it would probably be good to avoid those."
15-22 are the repeater outputs, but they're fine to use for FRS or GMRS simplex. I don't think there are many repeaters in the same areas as many jeep trails in CO, and even at my house where there are around 5 repeaters in range they are pretty quiet most of the time.
I'd guess 15-22 would attract more people of the mantra; "more is better", leaving 1-7 less used. I've been trying to scan the band when I am out but I haven't been out on the trails much yet with these radios. Certainly if multiple groups are on these 5W channels they can be spaced a little closer before they start to bother eachother compared to 15-50W on 15-22. If one of the high power channels were to be particularly useful it would be before you arrive at the trailhead... if you wanted to try and catch up with people on the highway. You could recommend separate highway and trail channels in that case.
It would be simpler to run without CTCSS and DCS codes. If it ever gets annoying in the future with chatter from other groups, the recommendation could always be revisited.
EDIT: Reading back through this, there's a chance some folks may not realize that since the FRS/GMRS rule changes in 2017 the FRS and GMRS channel numbering have been standardized and are shared between services. If we want to recommend default GMRS and FRS channels, it makes a lot of sense that they be the same. If you are using an older GMRS radio this may not be the case but all of your channels will match up with an FRS channel.
Channels 8-14 are specified for handheald radios by rule, and would not be accessible by GMRS mobile radios (think wired mic and external antenna). These channels are also limited to 1/2 watt and may not make much sense to use as a default trail channel for vehicle to vehicle purposes.