Which type of buoy indicates the safe passage to the port side as per IALA Region A?

The lateral buoy is the correct choice for indicating safe passage to the port side in IALA Region A. IALA Region A utilizes a system where lateral buoys are used to mark the navigable channel and guide vessels safely through it. In this system, port side buoys are colored red and typically feature a cylindrical shape, serving as a visual cue for mariners that they should keep this buoy on their port side when entering a harbor or navigating a channel.

Considering the other types of buoys, cardinal buoys are used to indicate safe water on the cardinal points of the compass (north, south, east, west) rather than specifically marking channels. Safe water buoys, often colored white with red stripes, signal that there is navigable water in all directions but do not indicate a particular side to pass. Special mark buoys, which can signify various types of information or areas (like no-entry zones or underwater cables), do not provide lateral guidance regarding navigable passages.

The lateral buoy’s specific design and color coding within IALA Region A are critical for mariners, as they convey essential safety information regarding navigation routes and harbor entry points.