I believe they’re connected with this… w8cmn.net – W8CMN – DMR/Mi5 – Mi6WAN – P25 – APRS1011 has Emmet and Cheboygan Counties RIDs on it, G-EVENT02. Not sure what exactly it's being used for, as it's only come up once or twice for me today off River Central and Rapid City.
22:55 Update: Units are referring to themselves as '701' (Cheboygan) and '703' (Emmet).