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\subsubsection*{Event Flags for All IvP Contact Behaviors}

The Convoy behavior is a subclass of the general IvP Contact Behavior
class, which in turn is a subclass of the IvP Behavior class. A contact
behavior inherits the \bvar{cnflag} event flag. This single event
flag supports several types of events that, for example, can be
trigger based on the range to the contact, crossing the contact from
port to bow, or crossing passing the contact from fore to aft, or
upon closest point of approach (CPA) to the contact, among several
others.

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