Gevent 6 tg 1015 is main, bayanet tg 2818, dnr, fugitive apprehension tg 3645 are ones being used.
no point in tuning online as none of these are carried and actually the isabella county online scanner is very quiet.
I believe they have switched the primary channel from Gevent 6 to 37tac1. I have heard a couple units state this on 37P911. They are still using 37P911 as well