Your ARPA has two guard zones. What is the purpose of the inner guard zone?

Correct Answer: Option D — Warn of small targets that are initially detected closer than the outer guard zone

ARPA guard zones are designed to automate target acquisition. The inner guard zone is specifically configured to detect smaller targets or those that appear closer to the vessel than the outer zone, ensuring the watch officer receives timely alerts for potential collision threats that require immediate attention and assessment.