A few posts on this tread already, but as has been posted above 462.475 isn't GMRS.
462.475 is the repeater output the frequency the repeater transmits on. 467.475 would be the input frequency the one mobiles and handheld radios transmit on. This is the standard for this band.
Please read all the posts on this tread.
GMRS can be used between users with different callsigns. The local CERT teams use GMRS for nets. The also own and sponsor a few of the local GMRS repeaters.
Also GMRS is heavily used for off road or Jeep people for communications, rather than CB. These groups mostly use a Midland GMRS mobile radios.