For clarification - the divisions were setup by the Wrightwood Communications Group, OK'd by Wrightwood Fire Station 101 and adopted by Wrightwood CERT.
During the past few months a committee was formed that has been working on developing a Wrightwood Cooperative Emergency Operation Plan (EOP). This initial planning committee consists of representatives from LA & SB Supervisor Offices of Antonovich and Mitzelfelt, LA County OEM, SB County OES, SB County Fire, Wrightwood Disaster Preparedness Team & CERT, Wrightwood Fire Safe Council and a few others.
The committee is reviewing how the area is divided into divisions and will likely be adding 4 additional divisions. Those new divisions will include organizational camps near Jackson Lake, Table Mountain/Mountain High, Desert Front Road and Horse Canyon areas.
Here's the current division map being used within the residential areas of Wrightwood

Here's the current CERT FRS channels used in each division
Div A Ch 8 467.5625
Div B Ch 9 467.5875
Div C Ch 10 467.6125
Div D Ch 11 467.6375
Div E Ch 12 467.6625
Div F Ch 13 467.6875