OK Lads, thanks for the help.
I just discovered that I can enter the Rx freq but not a Tx freq ...so I need a decent/reliable base-station type GMRS rig as my D578 seems to be
Whooda thunk? I finally wanted to setup extra Comms for emergencies and hadn't tried my new-ish GMRS license until yesterday when I went about trying to enter the channels.
Actually, maybe I need a Repeater (?) .. Seriously, there are none that I can find within a hundred miles. I am on a ridge and could put a colinear on one of my towers.