Your Electronic Plotting Aid (EPA) has two guard zones. What is the purpose of the inner guard zone?

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

Electronic Plotting Aids utilize guard zones to automate target detection. The inner guard zone is specifically designed to detect small targets that appear closer to the vessel than the outer zone, providing an early warning for potential close-quarters situations that require immediate attention from the watch officer for collision avoidance.