Well I know of at least 1 change that has to go to the db - under MTA, 453.475(167.9) is being used by the McHenry detachment full time; it's not a spare. 453.10 should be dropped.
Anyway, I'd also listen to 453.575 for the Port of Baltimore detachment - the correct PL is on the RRDB (a couple of other detachments also use the freq but with different PLs)
And yet a few more targets...
. Baltimore city (even if you can't do digital, fire dispatch would be handy; and I'd check all the old 453 Mhz freqs just to see if they're being used by plows, ect. as chit chat channels...)
. US Park Police - all of these use PL 127.3 except for 166.85, which is CSQ and a simplex ch.4 (which I've heard only rarely); I might have chs 1 and 3 reversed - doing this from memory...
166.725 ch.1
166.925 ch.2 main dispatch (yes, you would expect ch.1 to be dispatch, but it's not...)
167.075 ch.3
. Mutual Aid 154.28
. Marine ch 16 (156.8), 22a (157.10) and 23a (157.15), where Sector Baltimore has been heard in the past (even tho they can come up on any marine channel...)
. PMARS 866.3625 (156.7) for you folks in the Montgomery/PG county areas; everyone else probably should listen for the translator on 39.62
Whew! that should be enough....73s Mike