When using an ARPA, what should you consider in order to evaluate the information displayed?

Evaluating the information displayed on an ARPA (Automatic Radar Plotting Aids) system involves considering navigational constraints, which can affect how a target vessel behaves and interacts with your vessel. When a target vessel is in proximity, various factors such as traffic separation schemes, local regulations, or safety zones might necessitate that the vessel adjust its course. Therefore, understanding these navigational constraints allows for better prediction of the target vessel's movements and aids in collision avoidance planning.

Recognizing that a vessel may need to change course due to these constraints is key in effective navigation and situational awareness. This consideration helps in interpreting ARPA data effectively and anticipating potential changes in target behavior, contributing to safer navigation overall.