Which are considered primary surface-sensing assets used to detect and track contacts on the surface?

• A. Radar, EO/IR sensors, AIS data
• B. Sonar, Magnetic Anomaly Detector, Weather Radar
• C. GPS, VHF, Infrared sensors
• D. AIS data only

Answer: (A)

Detecting and tracking surface contacts relies on sensors that give you range, bearing, identity, and visual confirmation. Radar is the workhorse for surface surveillance: it actively sends out signals, detects returns from ships and small craft, and provides range and course information to maintain tracks, even in cluttered or poor visibility. Complementing radar, EO/IR sensors deliver visual and thermal imagery, which helps identify and classify targets, confirm alerts, and track contacts when radar imagery is ambiguous or degraded. AIS data adds a crucial identity layer by broadcasting each vessel’s name, type, course, speed, and destination, allowing you to correlate radar tracks with actual ships and recognize vessels that may not be easily seen on radar alone.

Other options either target different domains or provide only partial information. Sonar detects underwater objects, which isn’t used for surface contact detection. Magnetic Anomaly Detectors are geared toward submarine detection, not routine surface tracking. Weather radar focuses on precipitation and weather patterns, not surface targets. GPS and VHF are navigation and communications tools, while Infrared is part of EO/IR sensing rather than a standalone surface-detection asset. AIS data alone is insufficient for a complete surface picture because it only provides reported information from vessels, not all contacts, and without a sensor like radar or EO/IR you can’t reliably detect and track them.