Vessel Collision Risk Quiz

What is the primary visual indicator of a potential risk of collision between two vessels?

• Rapidly changing bearing

• Constant bearing with increasing range

• Constant bearing with decreasing range

• Changing color of vessel lights

Which tool is commonly used to determine the bearing of another vessel?

• Radar

• Echo sounder

• Hand-bearing compass

• Sextant

In visual observation, which element is NOT essential to monitor regularly?

• Bearing

• Range

• Color of the hull

• Relative motion

What does Rule 15 of the COLREGs deal with?

• Overtaking situations

• Crossing situations between power-driven vessels

• Head-on situations

• Action by the stand-on vessel

If you see a vessel maintaining a constant bearing and coming closer, what should you conclude?

• No risk of collision

• Vessel is overtaking

• Risk of collision exists

• Vessel is turning away

According to Rule 15, if another power-driven vessel is on your starboard side, what should you do?

• Maintain speed and course

• Sound five short blasts

• Alter course to starboard

• Keep out of the way

What environmental factor can reduce the accuracy of visual range estimation?

• Calm sea

• Good visibility

• Clear night

• Heavy rain

What does a vessel typically observe to estimate another ship’s speed and course visually?

• The ship’s color and size

• The height of mast

• Bow wave and wake

• Navigation lights only

What is the purpose of taking repeated bearings of another vessel?

• To measure depth

• To verify color coding

• To determine change or constancy in bearing

• To adjust your compass

If the bearing of another vessel is changing, what does this likely indicate?

• Collision risk exists

• You are overtaking

• No risk of collision

• The vessel is adrift