Observe and identify
Developing level, about 2 min. IALA Region B.
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?
- Port-hand mark · Region B
- Starboard-hand mark · Region B
- Preferred channel to starboard · Region B
Answers and explanations
Lookout: Can and cylinder mean port; use Region B for the colour.
The sound answer
Port-hand mark · Region B
Green can-shaped lateral mark. Following the conventional direction of buoyage, leave it to port. Region B reverses the lateral colours while retaining the port-hand can shape.
Why the other options fall short
Starboard-hand mark · Region B
Red conical lateral mark. Following the conventional direction of buoyage, leave it to starboard. The region does not determine which collision-rule jurisdiction applies. Here the observed cue identifies port-hand mark · region b. Green can-shaped lateral mark. Following the conventional direction of buoyage, leave it to port. Region B reverses the lateral colours while retaining the port-hand can shape.
Preferred channel to starboard · Region B
A green port-hand form with a broad red band marks a junction. Following buoyage, leave it to port for the preferred branch to starboard. Identify the dominant colour and shape together. Here the observed cue identifies port-hand mark · region b. Green can-shaped lateral mark. Following the conventional direction of buoyage, leave it to port. Region B reverses the lateral colours while retaining the port-hand can shape.
Lateral marks · Region B
Green can-shaped lateral mark. Following the conventional direction of buoyage, leave it to port. Region B reverses the lateral colours while retaining the port-hand can shape.