Some on the Eastern Shore are using 800, and when they are out of range, they revert to low band. MSP Glen Burnie is on the county system, but they too use their old 39.04 frequency. MSP Annapolis no longer exists; that barrack was closed this past spring.
I often hear MSP Waterloo on the Howard county system, but rarely, if ever, do I pick them up on their 39 mhz freq. The opposite is true for Golden Ring - I hear them frequently over their usual 39 mhz freq, but haven't noticed them use their talkgroups on the Baltimore county system all that often. To be honest, when I'm in Baltimore county, I am usually watching the roads more carefully - I really need to put an audio alert on my 396 when Golden Ring uses the County system, so I know they are actually there.
73 Mike