What is happening at the incident?
When a critical incident occurs, often keeping an overview of the situation is difficult, even though it can save time and lives.
Not only the people coordinating the different teams on the field, but also other organizations and higher hierarchies want to keep an overview and (send) help where needed. But to do so, they need to now what, when and where to send the extra help.
And of course other team members like to know the situation of each member. Any minute counts in these moments.