COLREGs — rule by situation

Pick four parameters: your vessel, the other vessel, the encounter (head-on / crossing / overtaking), and the visibility. The picker returns the applicable rules and the required action — useful for STCW oral-exam preparation or a quick refresher on watch.

Always cross-check with the full text of the COLREGs and with your ship's own instructions; this is a study aid, not an authority.

My vesselOther vesselEncounterVisibility

Result

Give-way

I am the give-way vessel. Alter course to starboard or reduce speed; do NOT cross ahead.

Applicable rules

Rule 5 — Look-out
Rule 6 — Safe speed
Rule 7 — Risk of collision
Rule 8 — Action to avoid collision
Rule 11 — Application (in sight)
Rule 15 — Crossing situation
Rule 16 — Action by give-way vessel

Notes

· She is on my starboard side; I keep out of her way and avoid crossing ahead.

COLREGs — rule by situation

Result

Applicable rules

Notes

See also

COLREGs — rule by situation

Result

Applicable rules

Notes

See also