https://www.radioreference.com/db/aid/1264
FG = fireground channel = ie aka yadda short range / onscene / tactical channel
info was added to rrdb in feb 2025
apparently they took 2 of the VMR channels and reassigned them for use
as FGNB and FGCB
there does not seem to be a FGSB
the channels are referenced in the july 2025 version of the metrofire ops manual
but as of today - the new terminology is not being used - medford had
a 2 alarm fire and they said that "Fireground North" was the FG
channel - they did not say FG "North Alpha" was the fireground channel