Marshals Duties
The duties vary according to the role you will be carrying out, they are split into sections such as controls (arrival, start, flying finish, stop, passage control, service in, service out). Although the actual tasks involved vary with each control, the fundamentals are the same. The role is to give the competitor a time on their time card, this usually involves one person completing a check sheet, one person dealing with the time cards, with additional people starting the cars on their due time or using the timing equipment to time cars over the flying finish.
On stage marshals
On stage marshals are usually placed at a "junction" or "post" that is defined in the competitors road book and their role is to keep the stage safe. This usually involves making sure the stage is set up to the correct guidelines, with regards to setting up arrows and tape, controlling spectators within their junctions keeping them safe, along with dealing with any incidents that may occur - this can be anything from a car breaking down to a major incident where medical help is required.
Radio Crews
Radio crews (using the MSA safety frequency) check the passage of cars through the stage by keeping a check sheet of the cars as they pass, they also look out for cars that might go "missing" during a stage (i.e. breaking down etc between posts and out of sight). It is important to remember that radio crews are also marshals, unless there are marshals at that post, in the absence of marshals the radio crew often have to deal with the stage equipment and arrows, for this reason radio crews should be at least 2 strong so that one can stay with the radio and one can deal with other incidents or become a "runner" to attempt to find missing cars.