"searched" trunked freq.s

I have found quite-a-few 800 mhz freq.s using search and sweeper that aren't listed on the radio referance database and am wondering if there is an easy way to decode the tgrp parameters. The owners manual does not do a good job at explaining things. The "Easier to read" manual is better but still lacking on how to's.

Any help in explaining how to do this would be much appreciated, if there is in fact a way of decoding.

Thanks,

Dave