Observe and identify
Developing level, about 2 min. IALA Region A.
The situation
A navigation light lies ahead. Start playback and watch at least one complete cycle. Its period is an illustrative charted example; identify the combination of colour and rhythm.
Which mark matches the light you observe?
- Starboard-hand mark · Region A
- Port-hand mark · Region A
- Preferred channel to starboard · Region A
Answers and explanations
Lookout: Cone pointing up means starboard; use Region A for the colour.
The sound answer
Starboard-hand mark · Region A
Green conical lateral mark. In the conventional direction of buoyage, leave it to starboard; travelling against that direction reverses the side of your vessel on which you leave it.
Why the other options fall short
Port-hand mark · Region A
Red can-shaped lateral mark. In the conventional direction of buoyage, leave it to port. In the opposite direction, leave it to starboard. Read the charted buoyage direction rather than assuming every passage is inward. Here the observed cue identifies starboard-hand mark · region a. Green conical lateral mark. In the conventional direction of buoyage, leave it to starboard; travelling against that direction reverses the side of your vessel on which you leave it.
Preferred channel to starboard · Region A
A red port-hand form with a broad green band identifies a junction. Following buoyage, leave it to port for the preferred branch to starboard. The chart still determines whether either branch suits your vessel. Here the observed cue identifies starboard-hand mark · region a. Green conical lateral mark. In the conventional direction of buoyage, leave it to starboard; travelling against that direction reverses the side of your vessel on which you leave it.
Lateral marks · Region A
Green conical lateral mark. In the conventional direction of buoyage, leave it to starboard; travelling against that direction reverses the side of your vessel on which you leave it.