GigaOm also points out that FireChat's a kickass app for big summer festivals like Burning Man, since cell reception is notoriously garbage and it's hard to find friends or locate stuff like water or beer tents when you can't use iMessage or Twitter.
Business Unit or BU refers to a division, facility or department of an organization. 1  Examples of business units include retail outlets and human resource department.
Divisions are established when the number of resources exceeds the manageable span of control of the Operations Chief. A Division is located within the Incident Command System organization between the Branch and resources in the Operations Section.