hello while limit searching on the gre-500 say 150-170 range while its scanning . if i have the scanner set to auto and it stops on a frequencie and it shows fm, how can you tell if this is fm, or nfm. what is the diffrence.as far as this how about any range how can you tell it just shows it as fm. how do you determin what this is fm or nfm. next thing is if i go to enter some new conv frequencies in a new system and i enter them as fm and there really nfm will these frequencies still be heard. can someone shed some lite on this for me just a tad confused?? thanks in advance for youre help.