Ok, I think I got this figured out now. It appears that there is a new fleet of talkgroups on the SA EDACS system simply called "Mutual Aid Channels" or "Aid Channels" for short.
For these fire incidents - the SA Command bus shows up on scene and patches whatever they feel necessary to those talkgroups - and that can be arbitrary. All BCFA and other Fire Departments all have these channels in their radios.
The AID channels are:
Code:
1873 M AID-1 Mutual Aid 1 M
1874 M AID-2 Mutual Aid 2 M
1875 M AID-3 Mutual Aid 3 M
1876 M AID-4 Mutual Aid 4 M
1877 M AID-5 Mutual Aid 5 M
1878 M AID-6 Mutual Aid 6 M
1879 M AID-7 Mutual Aid 7 M
1880 M AID-8 Mutual Aid 8 M
1881 M AID-9 Mutual Aid 9 M
1882 M AID-10 Mutual Aid 10 M
1883 M AID-11 Mutual Aid 11 M
1884 M AID-12 Mutual Aid 12 M
1885 M AID-13 Mutual Aid 13 M
1886 M AID-14 Mutual Aid 14 M
1887 M AID-15 Mutual Aid 15 M