I pulled up the ETRM:
"The scanner automatically decodes subaudible data it receives in the VHF (137-174) band. If you try to enter an offset frequency in the VHF and UHF-Hi bands (137–174 and 806–960 MHz), the scanner will ignore the entry."
"In Motorola II systems (no programming the fleet map required), all the blocks have size code, S0, which has a size limitation of 512 radios. "