Question 829Navigation General

The correct answer is C) A tracked target entering your preset CPA-TCPA limits. The Electronic Plotting Aid (EPA) is designed to monitor the movement of tracked targets and provide visual and/or audible alarms when certain predefined conditions are met. One of these conditions is when a tracked target enters the user-defined Closest Point of Approach (CPA) and Time to Closest Point of Approach (TCPA) limits. This alerts the operator to potentially dangerous situations where a collision may occur, allowing for timely action to be taken. The other answer choices are incorrect because: A) entering a guard zone may trigger an alarm, but this is not specific to the EPA; B) initial detection within a guard zone would not necessarily trigger an EPA alarm; and D) a target being lost for one scan may trigger an alarm, but this is not the primary function of the EPA.