Deck Officers COC Oral Questions

From  LIFE AT SEA By Nandkishore Gitte 

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  1. Draw the Flammability diagram. Flammability diagram

With the help of this diagram describe the use of

  • Explosimeter
  • Tankscope
  • O2 analyzer

Show the regions where these equipments can be used and regions where they cannot be used and why?

2. What is the criteria for changing a wire or deciding it to be unfit for use? ( 10% of wire in the length of 8 times the diameter)
  • What will you do if only 5% is damaged? ( take shore help, change end to end)
  • Where do you get this regulation? ( Workplace, Health and Safety Act, which replaces the Factory Act in 2006 in the Dock regulation, Singapore Acts)
  • Can you exceed the SWL of the wire ? (yes , once: only upto proof load, and is documented)
  • What are the proof load for the wires? Where do you get it from? (also check COSWAP)

3. What do you mean by ISPS? What is DOS? When it is used and between whom?

4. What are the things that are checked in a Load Line Survey?

5. What are the safety certificates found on board?
  • What is the validity and content of it. Validity for harmonized system.
  • How will you prepare for your Cargo Ship Safety Equipment Survey?

6. What is a Chain Register? How many sections are present in them? (4)
  • What is the difference between the checks in section I and section II ?
  • What do you mean by annealing? Why do we use it for?

7. What is the difference between the areas of Annex I and Annex IV of Marpol ?( write down)
  • Requirements of oil record book , maintained 3 years on board
  • Requirement of garbage record book. maintained 2 years on board
  • Garbage ( 400gt & 12 persons : plan and management, 12m and above proper placarding)
  • What is difference between SOPEP and SMPEP (Annex II)? Content of each of them.
  • What is a SECA region and the areas? ( sulfur emission control area,Baltic sea & North Sea ; see MPA Circular)

8. Stability CurveCapt.Loo (Extra) - Deck Officers (COC 3)

  • Angle of lol
  • Angle of vanishing stability
  • Angle of flooding
  • Angle of contraflexture
  • Importance of negative GM
  • Intact Stability Criteria .
  • How do you draw the GZ curve.
( from the cross curves given in the stability

Capt.Loo (Extra) - Deck Officers (COC 3)

This is an example of cross curve which is drawn with displacement on x axis and GZ on y axis for various angle of heel. These are ship specific.

A GZ curve can be drawn from it for a particular displacement of the ship by drawing a vertical line for the given displacement and extracting the values of GZ for a particular heel and drawing these points.




  1. Take bearing of a target from the window of his building using the azimuth circle ( prism bearing). Be careful about the arrow up and down?
  2. Handing over and taking over as 2nd mate.
  3. How will you take over radar?
  4. Efficiency of radar and blind sector and shadow sector and the cause of it? Draw
  5. How to do chart correction?
  6. How to do ASD correction?
  7. Passage Planning
  8. Watch keeping in port, during bunkering and action in case of oil spill during bunkering?
  9. Validity of all certificates: The safety certificates.
  10. Preparation to be done before LSA and FFA survey.
  11. Requirement for L/B, L/J and MOB marker. Write down. Very specific about the length of lines, timings and will cross question about it.
  12. Requirement for pumping out machinery space oil.
  13. Requirement for oil record book.
  14. Difference between SOPEP and SMPEP.
  15. How many special area and what 's the new special area in annex I ?
  16. Importance of Cargo Plan.
  17. Intact Stability
  18. Anchoring procedure and whats anchor cock a bill ?
  19. How the survey is conducted onboard to check the certificates issued by classification society?
  20. Principle of barometer . What is the significance of it and why you knock before reading is taken?
  21. What is load density? From where you find the load density? Who keeps the load density on board?
  22. Heading 000 Encounters east cardinal buoy Your action?
  23. All the characteristics of safe water mark?
  24. How you pass special mark/ can shaped special mark? (tell with respect to General direction of buoy age)
  25. Various lights, shapes and ROR.


  1. Requirement of magnetic compass as per solas?
  2. Requirement of Radar and Arpar as per solas?
  3. Drill mentioned in which chapter, what has to be done in it and when it it done? Time intervals.
  4. What is MSDS?
  5. What is snap back zone? various situation with diagram . Which is the safe place to stand for the person holding the stopper? show in the diagram. See this link :Snap Back Zones
  6. Emergency : Action in case of collision
  7. What are trading certificates and statutory certificates?
  8. Length of the rope connecting the MOB buoy to the MOB marker. Why , Significance
  9. How many types barometer are there?
  10. What is a compartment?
  11. What is conventional direction of buoy?


1. How will u take over as a second mate?
2. When taking over the bridge equipments what will check?
He wants to listen abt the familiarisation of the equipments and abt the operational manuals.
3. How will u know that ur publications are up-to date?
4. Plan a passage from Singapore to Australia.
5. When plotting ur courses what all things will u bear in mind?
6. How to correct charts?
7. How will u take over a watch at port?
8. At port how will u determine that ur ship is stable at all times?
He gave an example of two ships A & B. Ship A loads 50 containers under deck and 50 on deck
Ship B loads 90 containers u/d and 10 containers o/d.Tell which one is stable.You will have to tell him abt the shift
of COG nad explain everything. He is very particular abt it.
9. When loading containers o/d from where will u determine how many containers to load on a particular hatch
and if the lashing is proper or not?
10. What is a hydrometer?
11. Why do u use a hydrometer?
12. If u are in fresh water loading cargo, can u load above the summer load line?
13. If yes, why n how much.
14. What is IAMSAR?
15. Tell abt the search patterns of IAMSAR. When they are used?
16. One example when u can use sector search.
17. What is COSWP?
18. Bosun is going fwd. You ask him what he is doing. He says that he is going into the fore-peak tank.
What will u do?
19. What do you understand by working aloft and what are the precautions related with it?
20. How will u go abt preparing for a LSA survey?
21. What are the lifeboat and liferaft requirements for a cargo ship?
22. What are the requirements for free fall lifeboats?
23. EPIRB and its maintanence.
24. How many types of fixed fire fighting systems u had onboard ur ship?
25. How do u operate a fixed CO2 system?
26. Maintanence of fixed CO2 system.
27. Disposal of garbage.
28. What all trading certificates do u have onboard?
29. Your ship met with a collision.What will u do?
30. Now after the collision water is coming inside ur ship.What is happening to your ship?
31. How will u stop the ingress of water?
32. What do u undetstand by a water tight door?
33. Where did u find the water tight doors on ur ship?
34. When can u determine if a risk of collision exists?
35. Can there be a risk of collision even if the compass bearing of a vsl is changing? Why?
36. You are keeping watch on bridge, suddenly u experience restricted visibility. What will u do?
37. Rule 8, 10, 19
38. IALA
39. If u see a new buoy(new danger) that is not on the chart or ASD or anywhere, how will u know abt the danger of the buoy?
He wants to hear that the buoy will be duplicated if the danger is grave.
40.Lastly he just showed me some lights.


 Additional Questions (Scaned)


Assignments Useful For Priparing for Deck Officers COC Oral exams

 (This Downloadable File are in .WPS Format Which you can open using MS Word.)
                                                                                                                                    Nandkishore Gitte