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Navigation, radio and VDR · Lesson 7 of 7 · 13 min

Navigation and radio equipment at port state control

You will know how a PSC officer inspects navigation and radio equipment, which findings can detain a ship, and how to handle a failure honestly and lawfully.

A port State control officer (PSCO) usually starts on the bridge. In a few minutes they can see whether the radars are running and the ECDIS charts are up to date, check the GMDSS log, ask the officer of the watch to show a test, and read the VDR and AIS certificates. If something important is missing or not working, the inspection can turn into a detailed one, and sometimes into a detention.

In 2024 the Tokyo MOU recorded 8,066 safety of navigation deficiencies and 1,244 radio communication deficiencies. The IMO Procedures for port State control, 2025, adopted by resolution A.1206(34) in December 2025 to replace the 2023 version, set out what PSCOs look for. This lesson walks through a bridge inspection and the decisions the master and officers make along the way.

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In this lesson

  • A port State control officer on the bridge
  • In plain words
  • In detail
  • What the rules say
  • Flag and class notes
  • Key numbers
  • What inspectors find
  • Quiz: 6 questions

A port State control officer on the bridge

Port State control is the right of a country to inspect foreign ships in its ports to check that they meet the international conventions. The PSCO first checks the certificates and documents and walks round the ship to form a general impression. If everything is in order and nothing looks wrong, that may be the end. If there are “clear grounds” to believe that the ship or its crew do not meet the rules, the PSCO carries out a “more detailed inspection”.

On the bridge, the PSCO will usually look at the navigation equipment against the Record of Equipment, the charts and publications, the passage plan, the VDR and AIS certificates, the GMDSS installation and its log, and whether the officers can actually use the equipment. Findings are recorded as deficiencies with an action: rectify before departure, within a set time, or at the next port. Serious ones can lead to detention, which is published and affects the ship’s risk profile, its flag’s and its class’s records.

What gives clear grounds

The IMO Procedures, section 2.4.2, give examples of clear grounds for a more detailed inspection. Those most relevant to the bridge are:

  • the absence of principal equipment or arrangements required by the conventions;
  • certificates that are invalid, or documents listed in appendix 12 that are not on board, incomplete or not maintained;
  • serious deficiencies in navigational equipment seen during the general inspection;
  • evidence that the master or crew are not familiar with essential shipboard operations; and
  • the emission of false distress alerts not followed by proper cancellation procedures.

Documents the PSCO may ask for

Appendix 12 lists the certificates and documents to be checked. For this course the key ones are:

Document Basis
Cargo Ship Safety Radio Certificate (or Cargo Ship Safety Certificate) with Record of Equipment (Form R) SOLAS I/12
Cargo Ship Safety Equipment Certificate with Record of Equipment (Form E) SOLAS I/12
Records of navigational activities SOLAS V/26 and V/28.1
Copy of the certificate of compliance for the VDR annual performance test SOLAS V/18.8
AIS test report SOLAS V/18.9 and MSC.1/Circ.1252
LRIT conformance test report SOLAS V/19-1

For the radio certificate, appendix 6 says its validity and Form R may be accepted as proof of the equipment, but the PSCO should make sure certificated personnel are carried for its operation and listening watches, should examine the radio log, and may carry out operational checks where necessary.

Detainable deficiencies on the bridge and in the radio room

Appendix 2 lists deficiencies that may warrant detention. Under SOLAS they include:

  • absence, non-compliance or serious deterioration of lights, shapes or sound signals (item 8);
  • absence or failure of the proper operation of the radio equipment for distress and safety communication (item 9);
  • absence or failure of the proper operation of navigation equipment, taking regulation V/16.2 into account (item 10);
  • absence of corrected navigational charts and other nautical publications for the intended voyage, noting that electronic charts may be used (item 11); and
  • absence or failure of a VDR, when its use is compulsory (item 17).

Under STCW, item 4 is the absence in a watch of a person qualified to operate equipment essential to safe navigation or safety radiocommunications.

Appendix 7 adds operational failings that may justify detention, including lack of awareness of the operation and limitations of navigation equipment or how to test it, deck officers unable to demonstrate essential navigation equipment such as ECDIS and integrated navigation systems (including monitoring and interrogating alarms), and deck officers unfamiliar with operating and testing radio equipment or with how maritime safety information reaches the ship.

Regulation V/16.2 and the PSCO

The phrase “taking the relevant provisions of SOLAS 1974 regulation V/16.2 into account” matters. A ship whose equipment failed at sea, and whose master has planned around it, is not automatically detained. But V/16.2 only protects the ship where repair facilities are not readily available. The UK reads that as meaning no repair engineers or spares are available locally. In a port where a technician can be on board in hours, expect the PSCO to require the repair before departure.

Preparing the bridge for PSC

A practical pre-arrival check, based on the items above:

  1. Certificates and Form E and Form R match what is fitted, including any exemptions.
  2. VDR certificate of compliance and AIS test report are current and on board.
  3. ECDIS charts and permits are up to date for the voyage, and the back-up is ready.
  4. Passage plan covers berth to berth.
  5. Deviation card and compass book are current; shadow sector diagram is posted.
  6. GMDSS log is complete, daily and weekly tests are recorded, battery checks are logged.
  7. EPIRB, SART and two-way VHF battery and release expiry dates are in date.
  8. Every watchkeeper can demonstrate the radar, ECDIS, BNWAS and a GMDSS test call.
  9. Any defect is logged with the action taken, the company informed and a repair booked.
  • The IMO Procedures for port State control, 2025, section 2.4.2, give as clear grounds for a more detailed inspection the absence of principal equipment, documents not on board or not maintained, serious deficiencies in navigational equipment, crew unfamiliar with essential operations and uncancelled false distress alerts.1
  • The Procedures, appendix 2, section 5, list as possible grounds for detention the absence or failure of radio equipment for distress and safety communication (item 9) and of navigation equipment, taking SOLAS V/16.2 into account (item 10).1
  • The Procedures, appendix 2, section 5, list the absence of corrected charts and publications (item 11) and the absence or failure of a compulsory VDR (item 17) as possible grounds for detention.1
  • The Procedures, appendix 7, paragraph 5.1, say detention may be considered where deck officers cannot demonstrate essential navigation equipment such as ECDIS, or are unfamiliar with operating and testing radio equipment.1
  • The Procedures, appendix 12, list the copy of the VDR certificate of compliance (SOLAS V/18.8) and the AIS test report (SOLAS V/18.9) among the documents to be checked.1
  • SOLAS regulation V/16.2 says a malfunction does not make the ship unseaworthy or justify delay where repair facilities are not readily available, if the master plans a safe voyage to a repair port.4
  • SOLAS regulation V/18.8 requires a copy of the VDR certificate of compliance to be retained on board.3
  • MSC.1/Circ.1252, annex paragraph 4, requires a copy of the AIS test report to be retained on board.6
  • Regional MoUs. Each regional PSC regime (Paris MoU, Tokyo MOU and others) applies the IMO Procedures through its own manual and targeting system, and runs concentrated inspection campaigns. The 2017 joint Paris and Tokyo campaign targeted safety of navigation including ECDIS; check your regional MoU’s website for current campaigns before arrival.7
  • United Kingdom. MGN 610 explains that a ship with a malfunction found in a UK port may be detained until it is repaired, but if repair facilities are not readily available the MCA may allow the ship to sail to the next port under a temporary dispensation.5
  • Flag and class after a deficiency. When PSC records a navigation or radio deficiency that affects a certificate, inform the flag and class, who may need to attend and confirm the repair. Follow your safety management system and the flag’s instructions.8
What Value
Tokyo MOU inspections, 2024 32,0542
Tokyo MOU safety of navigation deficiencies, 2024 8,0662
Tokyo MOU radio communication deficiencies, 2024 1,2442
2017 Tokyo MOU CIC: ships detained for CIC-topic reasons 36 of 6,720 (0.54%)7
2017 Tokyo MOU CIC: passage plan not covering whole voyage 5.0% of ships7
2017 Tokyo MOU CIC: navigation lights not as COLREG requires 4.5% of ships7
Maximum gap between VDR tests, cargo ship (within survey windows) 18 months3
  • Lights and passage plans. In the 2017 Tokyo MOU campaign, the most frequent findings were passage plans not covering the whole voyage (5.0%) and navigation or signal lights not complying with COLREG (4.5%); the lights caused 11 of the 36 campaign-related detentions.7
  • ECDIS. 2.5% of ships with ECDIS lacked up-to-date charts and a back-up, and 2.0% of watchkeepers could not demonstrate familiarity with ECDIS.7
  • BNWAS. 2.5% of ships could not show the BNWAS second or third stage alarm being recognised.7
  • Overall. Fire safety, life-saving appliances, working and living conditions and safety of navigation were the four major deficiency categories in the Tokyo MOU region in 2024, together 54% of all deficiencies.2
Can a PSC officer test the GMDSS?

Yes. The Procedures say the radio certificate may be accepted as proof of the equipment, but where considered necessary operational checks may be carried out, and the PSCO may ask officers to demonstrate equipment. A properly done test call is part of normal routine; avoid any live distress alert.

Will one broken radar always lead to detention?

No. The Procedures list failure of navigation equipment as a possible ground for detention, taking V/16.2 into account. The PSCO considers whether the ship can sail safely, whether repair facilities are available and what the master has done.

What if the PSCO disagrees with our flag's interpretation, for example on compass adjustment intervals?

Show the flag’s circular and your records. If a deficiency is recorded that you believe is wrong, the company can use the MoU’s review or complaint procedure and ask the flag to comment.

Does a detention for a VDR failure affect the ship later?

Detentions are published by the regional MoUs and feed into the ship’s risk profile, which affects how often she is inspected. They also count against the flag and recognized organization.

1Which of these is listed as a possible ground for detention in the IMO Procedures for port State control, 2025?
2Why does the detention item for navigation equipment mention SOLAS V/16.2?
3An officer accidentally sends a VHF DSC distress alert during a PSC demonstration. What is the most important immediate action?
4Which document is NOT on the PSC list of certificates and documents for this course’s equipment?
5The radio certificate and Form R are valid. What else does the PSCO check for the radio installation according to the Procedures?
6What is the best way to handle a known equipment defect when PSC boards?
  1. 1

    IMO Resolution A.1206(34), Procedures for port State control, 2025 (adopted 3 December 2025, revoking resolution A.1185(33)), section 2.4.2; appendix 2, section 5 (areas under SOLAS 1974 items 8 to 11 and 17; areas under STCW 1978 item 4); appendix 6, section 9; appendix 7, paragraph 5.1; appendix 12, items 5, 6, 21, 40, 41 and 42. https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/AssemblyDocuments/A.1206(34).pdf

  2. 2

    Tokyo MOU, Annual Report on Port State Control in the Asia-Pacific Region 2024, overview and Table 7. https://www.tokyo-mou.org/wp/wp-content/uploads/ANN24-1.pdf

  3. 3

    SOLAS 1974, as amended, regulation V/18.8 (as reproduced in IACS UI SC279), and IMO MSC.1/Circ.1222/Rev.1, annex paragraph 3. https://wwwcdn.imo.org/localresources/en/OurWork/Safety/Documents/IMO%20Documents%20related%20to/MSC.1-Circ.1222-Rev.1.pdf

  4. 4

    SOLAS 1974, as amended, regulation V/16.2, as reproduced in MCA MGN 610 (M+F), page 14. https://assets.publishing.service.gov.uk/media/5f2140d3e90e071a603d33b3/MGN_610_2020.pdf

  5. 5

    Maritime and Coastguard Agency, MGN 610 (M+F), SOLAS Chapter V guidance, guidance on regulation 16. https://assets.publishing.service.gov.uk/media/5f2140d3e90e071a603d33b3/MGN_610_2020.pdf

  6. 6

    IMO MSC.1/Circ.1252, Guidelines on annual testing of the automatic identification system (AIS) (22 October 2007), annex paragraph 4; SOLAS regulation V/18.9. https://wwwcdn.imo.org/localresources/en/OurWork/Safety/Documents/IMO%20Documents%20related%20to/MSC.1-Circ.1252.pdf

  7. 7

    Tokyo MOU, Report of the 2017 Concentrated Inspection Campaign on Safety of Navigation, including ECDIS, carried out jointly with the Paris MoU (November 2018), executive summary and Table 1. https://www.tokyo-mou.org/wp/wp-content/uploads/CIC-Safety-of-Navigation-including-ECDIS-Report-p.pdf

  8. 8

    SOLAS 1974, as amended, regulation I/11 (maintenance of conditions after survey), as referred to in MCA MGN 610 (M+F), guidance on regulation 16. https://assets.publishing.service.gov.uk/media/5f2140d3e90e071a603d33b3/MGN_610_2020.pdf

Rules checked 20 October 2026. VSL Safety is not an approved training provider and doesn't issue certificates. These lessons don't replace STCW training, or the manufacturer's training and certification that service technicians need.

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