There are a couple of other issues I see here:
1. Isn't GMRS limited to 2 watts for transmitters other than a repeater?
2. I don't think the CDM1250 is type accepted for GMRS.
Gmrs is limited to 50 watts on 462.550 575 600 625 650 675 700 and 725. The first 7 freqs on FRS are limited to 5 watts with gmrs license