Next step is to figure out what other agencies associate with that site. OSP Lancaster, Pickerington PD, Violet Fire and others, etc.
One thing I'm noticing on the Millersport site. They seem to be denying registrations for many of the Licking Co TGs. Is that common practice?
I was reading something the other day which indicated MARCS is the now the largest statewide system in the country, but at the same time is also the largest system in the country which still allows unrestricted statewide roaming by most users. There is a new statewide roaming policy in effect but it's being rolled out very slowly.
In line with the new statewide roaming policy, it's possible that you'll only see talkgroups for areas immediately adjacent to the tower. The new policy is that local talkgroups may roam within the home county and adjacent counties only, but there will be some tweaking of that; for example, Newark PD probably doesn't need and wouldn't have access to the tower.
If an agency is located within Fairfield County you can bet they'll have access (maybe not the prison, though). Violet Fire is a toss-up; since they use the MEC Center talkgroups which are based on the Columbus City site, they may not have access unless one specific talkgroup is so designated in order to limit unnecessary roaming (for example, a fire in Plain Twp really doesn't need to be roaming to the Millersport tower).