MSAP: COLREGS and Anti-Collision Questions

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27 Questions

What is the authorized light used to assist in the identification of submarines operating on the surface in accordance with COLREGS?

Intermittent flashing blue light

Which action would be considered 'good seamanship' as per COLREGS when proceeding in fog?

Using deck lights which may obscure approaching running lights

Which of the following vessels is 'not under command' as defined in Rule 3 of the Collision Regulations?

A sailing vessel becalmed

Which of the following vessels is NOT a vessel 'restricted in her ability to maneuver' as per Rule 3 of the Collision Regulations?

A tanker refueling a ship underway

What defines a vessel as 'restricted in her ability to maneuver'?

Engaged in a difficult towing operation

As the OIC on the bridge of a power-driven vessel, what should you do upon noticing a large sailing vessel approaching from the stern?

Prepare for possible evasive maneuvers

What action should a power-driven vessel following a traffic lane take if it wants to alter course to starboard?

Sound one short blast

Which vessels are NOT permitted to use inshore traffic zones?

Sailing vessels under 20 meters in length

When is a vessel required to sound two short blasts?

When altering course to port

What is the correct action for a vessel of 20 meters or more following a traffic lane?

Reduce speed and wait for the other vessel to pass

Is anchoring permitted in a narrow channel according to the text?

No, anchoring is prohibited

What should a vessel do if it hears a fog signal forward of the beam, according to Rule 19?

Reduce to minimum steerage way

When two ships are locked together after a collision, what should NOT always be done?

Make a substantial course alteration

What does a man aboard a vessel raising and lowering his outstretched arms to each side indicate?

The vessel is signaling that it is safe to pass

In a traffic separation scheme, which vessel is NOT permitted to impede the passage of a power-driven vessel following a traffic lane?

A fishing vessel

According to COLREGS, Annex I, paragraph (g), at what height above the hull should the sidelights of a power-driven vessel be placed?

Not greater than half of that of the forward masthead light

When in open waters and seeing lights right ahead at medium range, what should you do?

Maintain your current course and speed

Under COLREGS, Annex II, how far should the additional signals for fishing vessels be visible all around the horizon?

1.0 nautical miles

What responsibility does the MASTER of a ship NOT have in the event of a collision in the waters of a foreign nation?

Prepare survival craft for abandon ship

If you see flames aboard a vessel but notice that the vessel is not on fire, what does this indicate as per COLREGS, Annex IV?

The vessel is signaling that all is clear

According to Collision Regulations, which vessels can special rules allow additional whistle signals between?

Any type of vessels

When two masthead lights are carried for a power-driven vessel, how many meters higher should the after one be compared to the forward one?

2 meters

Which vessel is considered 'restricted in her ability to maneuver' as per Rule 3 of the Collision Regulations?

A vessel picking up a mark that restricts the navigational ability of the vessel and her tow to change course

Which type of vessel is 'not under command' based on Rule 3 of the Collision Regulations?

A vessel in a towing operation that restricts the navigational ability of the mark vessel and her tow to change course

Which scenario does NOT represent a vessel 'not under command' according to the Collision Regulations?

A vessel engaged in launching an aircraft

Which activity does NOT fall under vessels 'engaged in fishing' as per the Collision Regulations?

A vessel engaged in launching an aircraft

What does 'vessel constrained by her draft' mean according to the Collision Regulations?

A power-driven vessel severely restricted in her ability to deviate from her course due to her draft in relation to the water available

Study Notes

Vessels Restricted in Ability to Maneuver

  • A vessel transferring provisions while underway restricts its navigational ability to change course.
  • A vessel in a towing operation that restricts the navigational ability of the mark vessel and her tow to change their course.
  • A vessel whose anchor is fouled.
  • A vessel engaged in dredging.
  • A vessel engaged in launching or recovering a mine-clearing aircraft.

Vessels Not Under Command

  • A vessel transferring provisions while underway.
  • A vessel in a towing operation that restricts the navigational ability of the mark vessel and her tow to change their course.
  • A vessel whose anchor is fouled.
  • A vessel engaged in dredging.
  • A vessel engaged in launching or recovering a mine-clearing aircraft.

Vessel Constrained by Draft

  • A power-driven vessel severely restricted in its ability to deviate from its course due to its draft in relation to the available navigable water.

COLREGS Lights

  • Authorized light used to assist in the identification of submarines operating on the surface is an intermittent flashing blue light.

Good Seamanship

  • Practicing good seamanship involves using radar and fog signals, and proceeding at a speed that allows for taking advantage of a favorable current in a fog.

COLREGS Overtaking

  • When a power-driven vessel is overtaking another vessel, it should sound one short blast and alter course to starboard.

COLREGS Sailing Vessels

  • A sailing vessel becalmed or with restricted maneuverability is not "not under command".
  • A vessel engaged in underwater operations or a difficult towing operation is considered "not under command".

Inshore Traffic Zones

  • Inshore traffic zones shall not be used by vessels that cannot safely use the lane within the zone.

Anchoring in a Narrow Channel

  • Anchoring is not permitted in a narrow channel.

COLREGS Fog Signals

  • A vessel hearing a fog signal forward of the beam should take action to prevent a collision.

COLREGS Collision

  • After a collision, the master should not always attempt to make a substantial course alteration.

COLREGS Traffic Separation Schemes

  • A vessel engaged in fishing should not impede the passage of a vessel following a traffic lane.
  • A vessel of less than 20 meters in length or a sailing vessel should not impede the safe passage of a vessel following a traffic lane.

COLREGS Whistle Signals

  • The Government of any State can make provision for special rules allowing the use of additional whistle signals between vessels.

COLREGS Lights and Signals

  • The sidelights of a power-driven vessel should be placed at a height above the hull of not less than 1.5 meters or not greater than 4.5 meters.
  • Additional signals for fishing vessels should be visible all around the horizon at a distance of at least 1.0 nm.
  • If two masthead lights are carried for a power-driven vessel, the after one should be vertically higher than the forward one by at least 0.5 meters.

Test your knowledge of COLREGS (International Regulations for Preventing Collisions at Sea) and anti-collision procedures with this quiz. Identify the authorized lights for submarines operating on the surface and understand the concept of 'good seamanship' as required by the regulations.

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