Metro White (483.2875, 131.8, currently wide band)) was, and remains, the primary channel for communications between Fire Alarm offices of member departments. Metro White is not included in the apparatus.
Effective shortly, Metro North District (482.2500, 107.2, narrow band), Metro Central District (482.0250, 123.0, narrow band), and Metro South District (482.2125, 103.5, narrow band) -- all of which are repeated -- will be available for communications between member Fire Alarm offices within the sub-districts, most likely for non-fire or lesser incident mutual aid requests and administration.
Effective now or shortly, Metro North Fireground (482.1875, 141.3, narrow band), Metro Central Fireground (485.1875, 127.3, narrow band) and Metro South Fireground (485.1000, 114.8, narrow band) -- all of which are simplex channels -- are available for incident commanders to assign for fireground use. However, it is intended that all apparatus of member departments that respond to mutual aid requests will be equipped with UHF equipment capable of operating on the frequencies of all member departments, enabling enroute apparatus to communicate with the host Fire Alarm on the host dispatch channel and enabling incident commanders to use a host operating channel for the fireground, if desired.
Metro Red (483.3125, 131.8, currently wide band) was the channel to be used by mutual aid apparatus responding to a host community to respond to the host community Fire Alarm office, but, as noted, this is likely to supplanted by the use of the host community's usual operating channel.
As a result of the foregoing:
A) Monitoring of the White and District channels will provide one with announcements of mutual aid triggering events and mutual aid requests and responses, but
B) Monitoring of fireground traffic for such events requires access to the operating channels of each of the member Departments.