International maritime signal flags
from INTERNATIONAL CODE OF SIGNALS
GENERAL SIGNAL CODE
Editorial Note: In the "GENERAL SIGNAL CODE (Revised 2020)," multiple codes are listed under "Cross Reference," but these have been omitted here.
Editorial Note: Additionally, there are other omitted data not mentioned above. For details, please refer to the [INTERNATIONAL CODE OF SIGNALS ].
Editorial Note: Additionally, there are other omitted data not mentioned above. For details, please refer to the [INTERNATIONAL CODE OF SIGNALS ].
SECTION 3: AIDS TO NAVIGATION—NAVIGATION—HYDROGRAPHY
AIDS TO NAVIGATION
Buoys—Beacons
LK
Buoy (or beacon) has been established in lat… long…
LL
Buoy (or beacon) in lat… long… has been removed.
LM
Radiobeacon indicated is out of action.
Lights—Lightvessels
LN
Light (name follows) has been extinguished.
LN 1
All lights are out along this coast (or the coast of…).
LO
I am not in my correct position (to be used by a lightvessel).
LO 1
Lightvessel (name follows) is out of position.
LO 2
Lightvessel (name follows) has been removed from her station.
BAR
LP
There is not less than… (number) feet or meters of water over the bar.
LQ
There will be… (number) feet or meters of water over the bar at time indicated.
LR
Bar is not dangerous.
LR 1
What is the depth of water over the bar?
LR 2
Can I cross the bar?
LS
Bar is dangerous.
BEARINGS
LT
Your bearing from me [or from… (name or identity signal)] is… (at time indicated).
LU
The bearing of… (name or identity signal) from… (name or identity signal) is… (at time indicated).
LV
Let me know my bearings from you. I will flash searchlight.
LV 1
What is my bearing from you [or from… (name or identity signal)]?
LV 2
What is the bearing of… (name or identity signal) from… (name or identity signal)?
LW
I receive your transmission on bearing…
LW 1
Can you take bearings from my radio signals?
CANAL—CHANNEL—FAIRWAY
Canal
LX
The canal is clear.
LX 1
The canal will be clear at time indicated.
LX 2
You can enter the canal at time indicated.
LX 3
Is the canal clear?
LX 4
When can I enter the canal?
LY
The canal is not clear.
LZ
The channel/fairway is navigable.
LZ 1
I intend to pass through the channel/fairway.
LZ 2
Is the channel/fairway navigable?
LZ 3
What is the state of the channel/fairway?
LZ 4
What is the least depth of water in the channel/fairway?
MA
The least depth of water in the channel/fairway is… (number feet or meters).
MB
You should keep in the center of the channel/fairway.
MB 1
You should keep on the starboard side of the channel/fairway.
MB 2
You should keep on the port side of the channel/fairway.
MB 3
You should leave the channel/fairway free.
MC
There is an uncharted obstruction in the channel/fairway. You should proceed with caution.
MC 1
The channel/fairway is not navigable.
MC 2
The (—) lane of the traffic separation scheme is not navigable. (The direction of the traffic flow is to be indicated.).
COURSE
MD
My course is.…
MD 1
What is your course?
ME
The course to place (name follows) is…
ME 1
What is the course to place (name follows)?
MF
Course to reach me is…
MF 1
What is the course to reach you?
MG
You should steer course…
MG 1
What course should I steer?
MH
You should alter course to… (at time indicated).
MI
I am altering course to…
DANGERS TO NAVIGATION—WARNINGS
Derelict—Wreck—Shoal
MJ
Derelict dangerous to navigation reported in lat… long… (or Complements Table 3, Chapter 2, Section 10, Page 102).
MK
I have seen derelict (in lat… long… at time indicated).
MK 1
Have you seen derelict (or wreckage)?
ML
Derelict is drifting near lat… long… (or bearing… from place indicated, distance…).
ML 1
Hull of derelict is awash.
ML 2
Hull of derelict is well out of the water.
MM
There is a wreck in lat… long…
MM 1
Wreck is buoyed.
MM 2
Wreck is awash.
MN
Wreck (in lat… long…) is not buoyed.
MO
I have struck a shoal or submerged object (lat… long…).
MP
I am in shallow water. Please direct me how to navigate.
Radiation Danger
MQ
There is risk of contamination due to excessive release of radioactive material in this area (or in area around lat… long… ). Keep radio watch. Relay the message to vessels in your vicinity.
MQ 1
The radioactive material is airborne.
MQ 2
The radioactive material is waterborne.
MR
There is no, or no more, risk of contamination due to excessive release of radioactive material in this area (or in area around lat… long…).
MR 1
Is there risk of contamination due to excessive release of radioactive material in this area (or in area around lat… long…)?
MS
My vessel is a dangerous source of radiation.
MS 1
My vessel is a dangerous source of radiation; you may approach from my starboard side.
MS 2
My vessel is a dangerous source of radiation; you may approach from my port side.
MS 3
My vessel is a dangerous source of radiation; you may approach from forward.
MS 4
My vessel is a dangerous source of radiation; you may approach from aft.
MT
My vessel is a dangerous source of radiation. You may approach from… (Complements Table 3, Chapter 2, Section 10, Page 102).
MU
My vessel is a dangerous source of radiation. Do not approach within… (number) cables.
MV
My vessel is releasing radioactive material and presents a hazard.
MW
My vessel is releasing radioactive material and presents a hazard. Do not approach within… (number) cables.
MX
The radioactive material is airborne. Do not approach from leeward.
Warnings
MY
It is dangerous to stop.
MY 1
It is dangerous to remain in present position.
MY 2
It is dangerous to proceed on present course.
MY 3
It is dangerous to proceed until weather permits.
MY 4
It is dangerous to alter course to starboard.
MY 5
It is dangerous to alter course to port.
MY 6
It is dangerous to approach close to my vessel.
MY 7
It is dangerous to let go an anchor or use bottom trawl.
MY 8
It is dangerous to jettison inflammable oil.
MZ
Navigation is dangerous in the area around lat… long…
MZ 1
I consider you are carrying out a dangerous navigational practice and I intend to report you.
NA
Navigation is closed.
NA 1
Navigation is possible only with tug assistance.
NA 2
Navigation is possible only with pilot assistance.
NA 3
Navigation is prohibited within 500m of this platform.
NA 4
Navigation is prohibited within 500m of the platform bearing (—) from me.
NA 5
You have been detected navigating within a 500m Safety Zone (about the platform bearing (—) from me) and will be reported.
NA 6
Anchors with buoys extend up to one mile from this vessel/rig. You should keep clear.
NB
There is fishing gear in the direction you are heading (or in direction indicated—Complements Table 3, Chapter 2, Section 10, Page 102).
NC
I am in distress and require immediate assistance.
ND
Tsunami (phenomenal wave) is expected. You should take appropriate precautions.
NE
You should proceed with great caution.
NE 1
You should proceed with great caution; the coast is dangerous.
NE 2
You should proceed with great caution; submarines are exercising in this area.
NE 3
You should proceed with great caution; there is a boom across.
NE 4
You should proceed with great caution; keep clear of firing range.
NE 5
You should proceed with great caution; hostile vessel sighted (in lat… long…).
NE 6
You should proceed with great caution; hostile submarine sighted (in lat… long…).
NE 7
You should proceed with great caution; hostile aircraft sighted (in lat… long…).
NF
You are running into danger.
NF 1
You are running into danger; there is a radiation hazard.
NG
You are in a dangerous position.
NG 1
You are in a dangerous position; there is a radiation hazard.
NH
You are clear of all danger.
NH 1
Are you clear of all danger?
NI
I have (or vessel indicated has) a list of… (number) degrees to starboard.
NJ
I have (or vessel indicated has) a list of… (number) degrees to port.
DEPTH—DRAFT
Depth
NK
There is not sufficient depth of water.
NL
There is sufficient depth of water.
NL 1
Is there sufficient depth of water?
NM
You should report the depth around your vessel.
NN
I am in… (number feet or meters) of water.
*NO
Negative—“No” or “The significance of the previous group should be read in the negative”.
* Procedural signal.
NP
The depth of water at the bow is… (number feet or meters).
NQ
The depth of water at the stern is… (number feet or meters).
NR
The depth of water along the starboard side is… (number feet or meters).
NS
The depth of water along the port side is… (number feet or meters).
Draft
NT
What is your draft?
NT 1
What is your light draft?
NT 2
What is your ballast draft?
NT 3
What is your loaded draft?
NT 4
What is your summer draft?
NT 5
What is your winter draft?
NT 6
What is your maximum draft?
NT 7
What is your least draft?
NT 8
What is your draft forward?
NT 9
What is your draft aft?
NU
My draft is… (number feet or meters).
NV
My light draft is… (number feet or meters).
NW
My ballast draft is… (number feet or meters).
NX
My loaded draft is… (number feet or meters).
NY
My summer draft is… (number feet or meters).
NZ
My winter draft is… (number feet or meters).
OA
My maximum draft is… (number feet or meters).
OB
My least draft is… (number feet or meters).
OC
My draft forward is… (number feet or meters).
OD
My draft aft is… (number feet or meters).
OE
Your draft must not exceed… (number feet or meters).
OF
I could lighten to… (number feet or meters) draft.
OG
To what draft could you lighten?
ELECTRONIC NAVIGATION
Radar
OH
You should switch on your radar and keep radar watch.
OH 1
The restrictions on the use of radar are lifted.
OH 2
Does my radar cause interference?
OI
I have no radar.
OI 1
Are you equipped with radar?
OI 2
Is your radar in operation?
OJ
I have located you on my radar bearing… , distance… miles.
OJ 1
I cannot locate you on my radar.
OJ 2
You should alter your course, if possible, appreciably to starboard to facilitate location by radar.
OJ 3
You should alter your course, if possible, appreciably to port to facilitate location by radar.
OJ 4
Can you locate me by radar?
*OK
Acknowledging a correct repetition or “It is correct”.
* Procedural signal
OL
Is radar pilotage being effected in this port (or port indicated)?
OM
Bearing and distance by radar of vessel (or object) indicated, is bearing… , distance… miles.
OM 1
What is the bearing and distance by radar of vessel (or object) indicated?
ON
I have an echo on my radar on bearing… , distance… miles.
Radio Direction Finder
OO
My radio direction finder is inoperative.
OP
I have requested… (name or identity signal) to send two dashes of ten seconds each or the carrier of his transmitter followed by his call sign.
OP 1
Will you request… (name or identity signal) to send two dashes of ten seconds each or the carrier of his transmitter followed by his call sign?
OP 2
Will you send two dashes of ten seconds each, or the carrier of your transmitter, followed by your call sign?
OQ
I am calibrating radio direction finder or adjusting compasses.
MINES—MINESWEEPING
OR
I have struck a mine.
OS
There is danger from mines in this area (or area indicated).
OS 1
You should keep a lookout for mines.
OS 2
You are out of the dangerous zone.
OS 3
Am I out of the dangerous zone?
OS 4
Are you out of the dangerous zone?
OS 5
Is there any danger from mines in this area (or area indicated)?
OT
Mine has been sighted in lat… long… (or in direction indicated—Complements Table 3, Chapter 2, Section 10, Page 102).
OU
Mine(s) has (have) been reported in the vicinity (or in approximate position lat… , long…).
OV
Mine(s) is (are) believed to be bearing… from me, distance… miles.
OW
There is a minefield ahead of you. You should stop your vessel and wait for instructions.
OW 1
There is a minefield along the coast. You should not approach too close.
OX
The approximate direction of the minefield is bearing… from me.
OY
Port is mined.
OY 1
Entrance is mined.
OY 2
Fairway is mined.
OY 3
Are there mines in the port entrance or fairway?
OZ
The width of the swept channel is… (number feet or meters).
PA
I will indicate the swept channel. You should follow in my wake.
PA 1
You should keep carefully to the swept channel.
PA 2
The swept channel is marked by buoys.
PA 3
I do not see the buoys marking the swept channel.
PA 4
Do you know the swept channel?
*PB
You should keep clear of me; I am engaged in minesweeping operations.
* The use of this signal does not relieve any vessel from complying with the International Regulations for Preventing
Collisions at Sea 1972.
PB 1
You should keep clear of me; I am exploding a floating mine.
PC
I have destroyed the drifting mine(s).
PC 1
I cannot destroy the drifting mine(s).
NAVIGATION LIGHTS—SEARCHLIGHT
PD
Your navigation light(s) is (are) not visible.
PD 1
My navigation lights are not functioning.
PE
You should extinguish all the lights except the navigation lights.
PG
I do not see any light.
PG 1
You should hoist a light.
PG 2
I am dazzled by your searchlight. Extinguish it or lift it.
NAVIGATING AND STEERING INSTRUCTIONS
(See also Pilot in Chapter 2, Section 5, Page 85.)
PH
You should steer as indicated.
PH 1
You should steer towards me.
PH 2
I am steering towards you.
PH 3
You should steer more to starboard.
PH 4
I am steering more to starboard.
PH 5
You should steer more to port.
PH 6
I am steering more to port.
PI
You should maintain your present course.
PI 1
I am maintaining my present course.
PI 2
Shall I maintain my present course?
PJ
I cannot maintain my present course.
PK
I cannot steer without assistance.
PL
You should steer directly for the buoy (or object indicated).
PL 1
You should keep buoy (or object indicated) on your starboard side.
PL 2
You should keep buoy (or object indicated) on your port side.
PL 3
You can pass the buoy (or object indicated) on either side.
PM
You should follow in my wake (or wake of vessel indicated).
PM 1
You should go ahead and lead the course.
PN
You should keep to leeward of me (or vessel indicated).
PN 1
You should keep to windward of me (or vessel indicated).
PN 2
You should keep on my starboard side (or starboard side of vessel indicated).
PN 3
You should keep on my port side (or port side of vessel indicated).
PO
You should pass ahead of me (or vessel indicated).
PO 1
I will pass ahead of you (or vessel indicated).
PO 2
You should pass astern of me (or vessel indicated).
PO 3
I will pass astern of you (or vessel indicated).
PO 4
You should pass to leeward of me (or vessel indicated).
PO 5
I will pass to leeward of you (or vessel indicated).
PO 6
You should pass to windward of me (or vessel indicated).
PO 7
I will pass to windward of you (or vessel indicated).
PO 8
You should come under my stern.
PP
Keep well clear of me.
PP 1
Do not overtake me.
PP 2
Do not pass ahead of me.
PP 3
Do not pass astern of me.
PP 4
Do not pass on my starboard side.
PP 5
Do not pass on my port side.
PP 6
Do not pass too close to me.
PP 7
You should give way to me.
PQ
You should keep closer in to the coast.
PQ 1
You should keep further away from the coast.
PQ 2
You should follow the coast at a safe distance.
PQ 3
How far out from the coast?
PR
You should keep closer to me (or vessel indicated).
PR 1
You should come as near as possible.
PR 2
You should keep within visual signal distance from me (or vessel indicated).
PR 3
You should come within hailing distance from me (or vessel indicated).
PS
You should not come any closer.
PS 1
You should keep away from me (or vessel indicated).
TIDE
PT
What is the state of the tide?
PT 1
The tide is rising.
PT 2
The tide is falling.
PT 3
The tide is slack.
PU
The tide begins to rise at time indicated.
PU 1
When does the tide begin to rise?
PV
The tide begins to fall at time indicated.
PV 1
When does the tide begin to fall?
PW
What is the rise and fall of the tide?
PW 1
What is the set and drift of the tide?
PW 2
What is the depth at high and low water here (or in place indicated)?
PX
The rise and fall of the tide is… (number feet or meters).
PY
The set of the tide is… degrees.
PZ
The drift of the tide is… knots.
QA
The depth at high water here (or in place indicated) is… (number feet or meters).
QB
The depth at low water here (or in place indicated) is… (number feet or meters).
QC
You should wait until high water.
QC 1
You should wait until low water.
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