The Target Tracking (TT) feature continously tracks and provides positional information for up to ten targets. The optional ARP-11, heading data and speed data are required to use TT. An AIS device-equipped FR-8005 series radar can track target heading, name, speed and direction of movement. With AIS it is possible to identify and track the movement of other vessels in heavy fog, during night time and otherwise difficult conditions. Another benefit is that with AIS you can identify obscured targets that the radar signals cannot reach, giving you more time to act. AIS can display up to 100 targets simultaneously, TT can display up to 10 different targets simultaneously. AIS receiver and heading data are required.