Study by Images
Browse each vessel type with fixed-aspect 3D models, matching 2D light diagrams, and day/night controls.
23Power-driven vessel underway
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An interactive 3D illustration is shown here. The same content is described in the rule text and key takeaways below.
2D light grid
AheadStbdAsternPort
Power-driven vessel ≥ 50 m
5 lights
Ahead
Stbd
Astern
Port
Power-driven vessel < 50 m
4 lights
Ahead
Stbd
Astern
Port
Power-driven vessel < 12 m — simplified
3 lights
Ahead
Stbd
Astern
Port
Power-driven vessel < 7 m, max 7 kt (minimum)
1 lights
Ahead
Stbd
Astern
Port
Air-cushion vessel, non-displacement mode
5 lights
Ahead
Stbd
Astern
Port
WIG craft taking off, landing, or near surface
5 lights
Ahead
Stbd
Astern
Port