JD4x4

That's a nice chart you did.
 
Anyway what you pointed out you'll see elsewhere with the FCC rules where the language isn't clear. There is another area on the forums for FCC rule discussions. If you have further questions that area that would be the place to get answers and a lot of opinions.

Thanks again Lscott. That WikiPedia list is better than the one found on hamradio.me, and the last place I would have looked, lol.
In my downtime I also found that ecfr page and made a chart from there in a spreadsheet & printed it as a pdf.

I found the wording vague though when it came to Part E and power. 
 
In §95.1763-"GMRS channels" under (a, b, & c)  they all start with "Only mobile, hand-held portable, ... may transmit .." and under (d) it says "Only hand-held portable units may transmit on these 7 channels", so it looks like handhelds can use all of the channels.

But, (of course there's a 'but') in §95.1767- "GMRS transmitting power limits" under (a) (1) they mention mobile as 50 watts but not specifically handhelds. Then their §95.303 Definitions say "Hand-held portable unit. A physically small mobile station ...". So between 1763 and the defs calling them a small mobile I think I'm going to interpret that a "small" mobile can go up to 50W on the 462 & 467 "Main Channels" (not that I'd want to hold that near my head!), unless I've missed something.  
 
Anyway, thanks again for your help (and patience). I'll attach my chart with the rules & defs in it. If anyone sees that it's bad logic, bad info, I'll remove it.  FCC FRS & GMRS Freqs, Use, and Power.pdf

I believe that is correct. The FCC has them reserved exclusively for repeater inputs.
 
This link is a nice summary.
 
https://en.wikipedia.org/wiki/General_Mobile_Radio_Service
 
The link below is the most current version of the Part 95 sections. For GMRS you want subpart E.
 
https://www.ecfr.gov/cgi-bin/text-idx?SID=85a15d2032f9f51fa68cef9b9657e610&mc=true&node=pt47.5.95&rgn=div5
 
I have stuff like this printed out as PDF files, stored on the computer and smart phone along with all my radio operating manuals for easy reference.

This is what the FCC has to say about it when the rules were last changed:
 
§ 95.1767 GMRS transmitting power limits. This section contains transmitting power limits for GMRS stations. The
maximum transmitting power depends on which channels are being used and the type of station.
(a) 462/467 MHz main channels. The limits in this paragraph apply to stations transmitting on any of the 462 MHz
main channels or any of the 467 MHz main channels. Each GMRS transmitter type must be capable of operating
within the allowable power range. GMRS licensees are responsible for ensuring that their GMRS stations
operate in compliance with these limits.
(1) The transmitter output power of mobile, repeater and base stations must not exceed 50 Watts.
(2) The transmitter output power of fixed stations must not exceed 15 Watts.
( 462 MHz interstitial channels. The effective radiated power (ERP) of mobile, hand-held portable and base
stations transmitting on the 462 MHz interstitial channels must not exceed 5 Watts.
© 467 MHz interstitial channels. The effective radiated power (ERP) of handheld portable units transmitting on the
467 MHz interstitial channels must not exceed 0.5 Watt. Each GMRS transmitter type capable of transmitting on these
channels must be designed such that the ERP does not exceed 0.5 Watt.
 

Any UHF amplifier that covers up to 470 MHz should be fine.  However, there are some really big warnings I have about using an amplifier.
 
First, on the 462 MHz and 467 MHz main channels, 50 watts is the legal limit for mobiles, repeaters and base stations.  Fixed stations are limited to 15 watts. (A Fixed station is defined as a station at a fixed location that directly communicates with other fixed stations only.)
 
Second, on the 462 MHz interstitial channels (the channels between the main channels) stations are limited to an effective radiated power (ERP) of 5 watts, witch means the final power amplifier (PA) will likely need to have much less than 5 watts of output power.  This applies to mobiles, hand-helds, portables and base stations.
 
Then, to make things even more complicated, on the 467 MHz interstitial channels, stations are limited to an effective radiated power (ERP) of 0.5 watts, witch means the PA will likely need to have much less than 0.5 watts of output power.
 
So, be very careful on what frequencies you opt to use an amp on.  Frankly, I wouldn't spend the money, I would just get a new radio.  Quality UHF amplifiers are much more expensive than a radio that runs up to 50 watts.