What are the disadvantages of radar without the use of ARPA?

Radar without ARPA (Automatic Radar Plotting Aid) lacks automated tracking and data processing capabilities, making it more challenging for operators to monitor multiple targets effectively. This can lead to increased cognitive workload and the potential for human error in collision avoidance. Additionally, without ARPA, operators may not have access to essential information like target speed and course, which hinders decision-making in complex maritime environments. Overall, the absence of ARPA can reduce situational awareness and safety.