gp338

So i own a GP338 (VFH) and as a first responder, it goes with me everywhere. The EMS communication system where I live runs on a Repeater so the range is pretty good city wide however sometimes like lets say I'm on campus grounds or in an apartment, I can't seem to transmit on the repeater...

I have just received my Moto GP338 from ebay and it works quite well. I'm using it to monitor a few of my local fire/ems channels and use MURS. My question for those of you with more programming experience than myself is: How can I set it up so that if I select say channel 6 (1-5 is MURS and...