Welcome to the website where you can pass online the CES test on the subject «Navigation NA – Operational Level». Practice like this will help you as a marine specialist improve your knowledge with the help of online studying and appraisal practice. CES based on practical information and marine specialists experience.
CES tests developed for evaluating seaman basic knowledge by Seagull Company (rebranded as «OTG»), is an evaluating online-tool, used for revealing any professional preparation needed in specific fields of knowledge, defined by STCW.
- Version: 6.0.
- Test type: STCW.
- Level: Operational.
- Type: Navigation (NA).
CES tests have proven themselves as good tools for the selection and recruitment process, as well as advancing the level of knowledge of the current officers and crew. Ocean Technologies Group use various subjects for question creation, which includes:
- Crowd and Crisis Management;
- Integrated Navigation System (INS);
- Ballast water management;
- Handling and Stowage;
- Vessel operation management and safety;
- Marine engineering;
- Maintenance and repair, etc.
Current test contains Seagull CES questions on the subject «Navigation NA – Operational Level». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Navigation NA – Operational Level» subject includes theoretical and practical information about advanced training for work on any type of vessel. The test evaluates both knowledge and skills required for safe navigation at the operational level. It covers advanced topics such as voyage planning, collision avoidance and electronic chart systems (ECDIS). Candidates must demonstrate proficiency in interpreting meteorological data and applying it to navigational decisions. The exam includes scenario-based questions to assess situational awareness and decision-making in real-time conditions. Knowledge of international regulations (COLREGs) and ship handling in various weather conditions is essential. Practical simulations test the ability to operate radar, ARPA and other bridge equipment effectively. A strong emphasis is placed on emergency procedures, including distress signaling and search-and-rescue operations. Successful completion ensures readiness to work as a deck officer on any type of vessel under different sailing conditions.
On this site Crew Evaluation System Test on the subject «Navigation NA – Operational Level» contains 68 questions you need to answer with no possibility to go back to previous question. Therefore, we recommend carefully reading each question and making decision with no hurry. In case you have some difficulty answering, you have also possibility to request a hint.
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Amount of questions: 68.
Right answers marked with this sign .
According to the International Regulations for Preventing Collisions and the illustrated lights, what type of vessel is this and from what direction is it viewed?
This is a vessel engaged in pilotage operations, deploying or recovering a pilot. Looking at its port side.
This is a vessel engaged in fishing other than trawling, making way through the water, with outlying gear extending more than 150 m in the direction of the all-round white light. Looking at its port side.
This is a vessel at anchor, viewed from the stern.
This is a vessel engaged in towing, viewed from the starboard side.
A report to the bridge states that a person has fallen overboard, who should the OOW immediately inform?
Chief Officer and lifeboat party.
Safety Officer and medical personnel.
Master and Engine Room.
All crew members on deck.
A tug is moving towards the bow of the ship to make fast and is in the vicinity of the ship’s shoulder, as illustrated. What specific danger should be considered when making this approach to the bow?
The tug may be turned across the bow of the ship and also suffer a loss of stability with a danger of being turned over if touched by the ship.
The tug may encounter strong currents near the bow.
The tug may be at risk of being caught in the ship’s wake.
All of the alternative answers.
How can an ARPA best assist the bridge team to steer a suitable course to make good the entrance to a channel?
Use the mapping facility provided by the ARPA, create a map of the channel then display it for entry.
Alter course so that own-ship’s ground stabilised true vector passes through the entrance to the channel.
Monitor the speed of other vessels in the area.
Use the ARPA to predict the movements of nearby vessels only.
On a ship involved in a collision, what should happen immediately after the accident has taken place?
Crew should follow an emergency procedure.
The master should be called.
The ship’s log should be updated.
All non-essential personnel should be evacuated.
Super-refraction affects the performance of some bridge devices on the vessel. What should the bridge watchkeeper look out for?
The GPS may give errors of position because of interference of incoming signals from the satellites.
Abnormal ranges of VHF radio and very long range radar detection.
Increased frequency of AIS signal loss.
Unusual fluctuations in the ship’s speed readings.
The position of the ship is found by taking a series of bearings using a gyro compass. How should an error of 2 degrees HIGH be applied to each bearing?
The same error applies to all bearings and therefore it can be ignored.
Subtract 2 degrees from the bearings.
Add 2 degrees to the bearings.
Apply the error only to the first bearing taken.
Subtract 2 degrees from the bearings.
What should an ENC chart cell, with usage code 1, be used for on an ECDIS?
A coastal passage.
Over viewing an ocean when planning.
Navigating in restricted waters.
Conducting detailed harbor operations.
Which option best describes what lies below an isolated danger symbol seen on the chart display of an ECDIS?
There could be any obstruction that infringes the safety depth settings.
There is probably a man made subsea structure associated with oil or gas.
It indicates a safe anchorage area.
It represents a natural underwater feature.
With an ECDIS in track control mode, will the vessel’s position always be correct if the ship symbol is showing on a route leg?
Yes – because that is the meaning of track control.
No – because there may be a position error on the navigation signal.
Yes – the system automatically corrects any errors.
No – the ship symbol is only an indication of intended course.
A vessel breaks down whilst on a coastal passage. Which of the following actions should be taken by the bridge team?
Maintain the watch and ask the engineers to be as quick as possible repairing the fault.
Display the NUC signal, maintain the watch and determine how the ship is drifting.
Call for assistance and abandon the vessel.
Turn off all systems and wait for further instructions.
What sound signal can be made when nearing a bend in a river, with the view around the bend obscured by an intervening obstruction?
One prolonged blast.
Two prolonged blasts.
Three short blasts.
One short blast.
Which publication should be used to assist in learning the nautical English language?
Standard Marine Navigational Vocabulary.
Nautical English for Dummies.
The (IMO) Standard Marine Communication Phrases (SMCP) booklet.
International Maritime Dictionary.
What type of vessel would show the illustrated lights?
A sailing vessel of less than 10 metres in length, displaying the mandatory combined lantern in lieu of sailing lights, seen head-on.
A sailing vessel less than 20 metres in length, displaying the optional combined lantern in lieu of standard sailing lights, seen head-on.
A motor vessel of less than 10 metres in length, displaying the standard navigation lights.
A sailing vessel of more than 20 metres in length, displaying the standard sailing lights.
Which option best describes how an operator establishes what an isolated danger symbol represents, when seen on the chart display of an ECDIS?
Interrogate it and ask for a pick or information report.
Check with a senior officer.
Refer to the paper chart for clarification.
Use the ECDIS manual to look up the symbol.
What happens when an ECDIS performs a route validation or safety check?
The whole route is checked to see if there are any manually inserted chart updates along it.
The route is compared against the latest weather reports.
The whole route is checked for possible dangerous objects along it.
The route is analyzed for optimal speed and fuel efficiency.
When passage planning on ECDIS, which two functions should always be set correctly?
Course and speed of the vessel on each leg.
Safety depth contour and safety depth value.
Route waypoints and estimated time of arrival.
Weather conditions and tidal information.
This vessel is encountered at the mouth of a river. According to the International Regulations for Preventing Collisions and the illustrated shapes, what type of vessel is it?
This is a vessel engaged in dredging or underwater operations. The two balls in a vertical line indicate the side on which it is safe to pass; the two diamonds in a vertical line indicate the side on which an obstruction exists; the ball/diamond/ball indicate that the vessel is restricted in her ability to manoeuvre.
This is a vessel engaged in dredging or underwater operations. The two balls in a vertical line indicate the side on which an obstruction exists; the two diamonds in a vertical line indicate the side on which it is safe to pass; the ball/diamond/ball in a vertical line indicate that the vessel is restricted in her ability to manoeuvre.
This is a vessel engaged in fishing, displaying the appropriate signals for fishing operations.
This is a vessel under sail, displaying the appropriate signals for sailing vessels.
With the Master on the bridge, when is the Officer of the Watch officially relieved of their responsibility for the vessel?
When the Master starts giving steering orders.
When the Master informs the Officer of the Watch that he is taking over the ‘con‘.
When the Officer of the Watch hands over the logbook to the Master.
When the Officer of the Watch leaves the bridge for a break.
If a search and rescue aircraft flies over your vessel as shown in the three sketches, what does this mean?
The aircraft wants your vessel to proceed in the direction shown in the bottom image.
The aircraft is short on fuel and is returning to base but requests your vessel to continue searching.
The aircraft is conducting a routine patrol and does not require assistance.
The aircraft is signaling for your vessel to anchor and wait for further instructions.
When your vessel is engaged in a search and rescue activity, and an assisting aircraft flies across your stern rocking its wings, what does this mean?
The aircraft is telling me he is preparing to drop supplies or personnel in the water.
The aircraft is requesting your vessel to change course.
The aircraft is indicating that it will return for further instructions.
The assistance of your vessel is no longer required.
A ship turns around a theoretical point known as the hydrodynamic pivot point. Where is its position when a vessel is stopped in the water?
At the centre of gravity of the ship.
Unless a vessel is turning it does not exist.
At the bow of the ship.
At the stern of the ship.
The ship is slowing down after being at full speed. What will happen to the position of the hydrodynamic pivot point?
The pivot point will move towards the bow of the ship.
The pivot point will move towards the stern of the ship.
Nothing as the hydrodynamic pivot point only occurs in a turn.
The pivot point will remain in the center of the ship.
Can anything be done on a vessel with forward speed, to reduce the change in heading caused by a right hand fixed pitch propeller being put astern?
The rudder should be put hard to starboard to reduce the water flow to the left side of the propeller.
Yes, the rudder can be put to port.
The vessel should be stopped to minimize heading change.
The engine should be put to full astern to counteract the heading change.
A vessel has a right-handed fixed pitch propeller, what should happen to its heading, if the propeller was put full astern?
The vessel will slow down.
The vessel will maintain its heading.
The bow should swing to starboard.
The vessel will turn to port.
If the bridge watchkeeper is not keeping a proper lookout, why are they likely to be held responsible for a collision?
Because there was no VHF radio contact made before the collision.
Under the Rules a proper lookout should be maintained at all times and by all available means.
Because the vessel was not equipped with radar.
Because the vessel was operating in restricted visibility.
What allowances should be applied to an echo sounder reading, to compare the depth of water with the depth shown on a chart?
A correction that should be applied to the charted depth value shown on the chart.
The type of echo sounder being used.
The vessel’s draft and the water temperature.
Position of transducer below the water surface and the height of tide.
What is the purpose of a route geometry check on an ECDIS?
It checks the planned turns to see if they are greater than a previously set value.
It assesses the route against the vessel turning characteristics.
It verifies the route against the latest weather conditions.
It ensures that the route avoids all navigational hazards.
What are the three possible types of messages seen when there is an ECDIS alert?
Either an Alarm, a Warning or an Information.
Either a Notification, a Warning or a Alert.
Either an Alarm, a Warning or a Caution.
Either a Signal, a Warning or a Caution.
Who is responsible for the number and the position of any tugs to be used during a mooring operation?
Master will always decide how many and where the tugs are to be used because the vessel pays for them.
Pilot will advise the master based upon their knowledge of the berth and port area.
The port authority determines the number and position of tugs required.
The chief mate is responsible for the tug arrangements during mooring.
Your vessel is towing an unmanned barge and restricted in its ability to manoeuvre. The total length of the tow is 800 metres. What daylight signals are required by the International Regulations for Preventing Collisions at Sea?
A diamond shape, where it can best be seen shall be displayed on the tug and the tow. Three shapes shall also be displayed in a vertical line, the upper and lower being balls and the middle one a diamond.
Three shapes shall be displayed forward on the tug, in a vertical line, the upper and lower being balls and the middle one a diamond.
A single ball shall be displayed on the tug.
No signals are required during daylight for an unmanned barge.
According to the International Regulations for Preventing Collisions and the illustrated lights, what type of vessel is this?
This vessel is restricted in its ability to manoeuvre and is stopped in the water. I am seeing it from astern.
This vessel is not under command and is not making way through the water.
This vessel is engaged in fishing and displaying the appropriate lights.
This vessel is a sailing vessel under power.
The positions of the ship provided by the GPS receiver should always be verified by other means. Which of the following suggested methods would be the most accurate?
Radar bearings of three distinctive shore objects.
Radar ranges of three distinctive shore objects.
Visual observations of two nearby vessels.
GPS coordinates from a different GPS device.
A ship is turning slowly with the rudder hard over and the propeller stopped. What can be done to increase the rate of turn but not the forward speed?
Reduce the rudder angle to 20 degrees.
Increase the rudder angle to 30 degrees.
Use the bow thruster to assist the turn.
Give the engine a short full ahead.
A vessel is making sternway with the engine stopped and the rudder hard to starboard. What effect will this have on the vessel?
Depending on the vessel, there may be a small starboard swing develop.
Depending on the vessel, there may be a small port swing develop.
The vessel will stop moving immediately.
The vessel will turn sharply to starboard.
How does a GPS receiver indicate that the accuracy of the displayed position is reduced?
The GPS receiver is very precise and does not give any indication of accuracy.
A large HDOP value is displayed on the screen.
The receiver will emit a warning sound.
The displayed position will blink on the screen.
After just leaving a berth, which is the best way to quickly assess the compass error?
By using the variation value on the navigational chart in use.
By comparing the compass reading with the GPS position.
By checking the compass against a known heading.
By taking a transit bearing of two fixed geographical objects.
What can be a cause of error observed on a gyro compass reading?
Incorrectly set heading and speed values.
Incorrectly set latitude and speed values.
Magnetic interference from nearby equipment.
A malfunctioning gyro sensor.
What is the direction of wind associated with an anticyclone (area of high pressure) in the Northern Hemisphere?
Directly away from the centre of the anticyclone towards the nearest Low pressure.
A malfunctioning gyro sensor.
Clockwise around the high pressure.
Counterclockwise around the high pressure.
The vessel with the illustrated lights is sighted ahead and slightly to port. What do the lights tell you about the status of the other vessel, and what should happen on your vessel?
This is a vessel engaged in fishing vessel, with her nets fast on an obstruction. My vessel should keep out of the way by rule 18 of the International Collision Regulations.
This vessel is aground. My vessel should be navigated with extreme caution given the nature of the hazard.
This vessel is under sail. My vessel should maintain course and speed.
This vessel is a power-driven vessel. My vessel should alter course to starboard.
After passage planning with ECDIS, how should the route be checked for safety?
Transfer the ECDIS plan onto paper charts.
Using the ECDIS route checker and by visually sighting all along it.
Consult the latest navigational warnings.
Using the ECDIS route checker and by visually sighting all along it.
Which option correctly completes the following statement? ‘A position filter on a navigational receiver or ECDIS system protects the ECDIS from…‘
…Incorrectly set up ECDIS system software.
…showing a fluctuating position of the vessel.
Inaccurate GPS signals.
External magnetic interference.
Which statement best describes how an ENC chart gives advice on sounding data quality?
‘The chart has text on it that describes the sea floor type‘.
‘The chart includes a color-coded depth scale‘.
‘The chart provides historical depth measurements‘.
‘The chart has a Zone of Confidence function‘.
Ideally, how should an anchor be secured for a long sea passage?
The anchor to be pulled all the way into the hawse-pipe and secured by the windlass brake, the chain stopper and lashings.
The anchor to be all way in the hawse-pipe and secured by the windlass brake and chain stopper.
The anchor should be left hanging over the side with minimal securing.
The anchor should be stored in the locker without any securing.
The ship’s engine is going astern and the ship is picking up sternway. The rudder is amidships and the ship has a single, right-handed, fixed pitch propeller. What would be expected to happen?
The ship will probably start to change heading to port and stern speed will increase.
The ship will remain on a straight course with no change in heading.
The ship will turn sharply to port and lose speed.
The ship will probably start to change heading to starboard and stern speed will increase.
Super-refraction effects the performance of some bridge devices on the vessel. What should the bridge watchkeeper look out for?
The GPS may give errors of position because of interference of incoming signals from the satellites.
Abnormal ranges of VHF radio and very long range radar detection.
Increased frequency of AIS alerts.
Fluctuations in the ship’s speed over ground.
According to Rule 35 of the International Regulations for Preventing Collisions what sound signal is made by a vessel not under command when in or near an area of restricted visibility?
One prolonged blast, followed by two short blasts, at intervals of not more than two minutes.
Two prolonged blasts, followed by one short blast, at intervals of not more than two minutes.
Three short blasts, repeated at intervals of not more than one minute.
One short blast, followed by one prolonged blast, at intervals of not more than three minutes.
Your vessel is in an area of restricted visibility. You hear this sound signal. What does it mean?
That there is a vessel at anchor in the vicinity.
That there is a vessel in distress nearby.
That there is a fishing vessel operating in the area.
That there is a vessel approaching from the opposite direction.
What does the acronym HDOP stand for when seen on an ECDIS or navigational receiver?
Horizontal depth of precision.
High definition of position.
Horizontal distance of position.
Horizontal dilution of precision.
Which option correctly completes the following statement in relation to ECDIS? Isolated danger symbols are not seen on a vector chart when they should be because…
…there will be some other symbol there that gives the same visual information.
…the safety depth settings do not have the correct values entered.
…the chart is outdated and not updated regularly.
…the display settings are set to a low resolution.
Which of the following statements is the most accurate in relation to the safety depth contour setting on an ECDIS?
The safety depth contour has to be set at a value to reflect the vessel’s draught.
The safety depth contour value is best set at a high value.
The safety depth contour should be set to the average depth of the area.
The safety depth contour is irrelevant to the vessel’s navigation.
Which statement best describes how land moves, if at all, on an ECDIS set in North-up, relative-motion mode?
Land on the chart screen moves relative to the ship symbol.
Land is stopped with the vessel symbol moving across the sea floor.
Land moves in the opposite direction of the vessel’s movement.
Land appears to move in a circular motion around the vessel symbol.
Which statement best describes why a previously validated route would have to be re-validated on an ECDIS?
Revalidation is always necessary when it has been removed from the chart display.
Revalidation is necessary when there have been chart updates.
Revalidation is required only if the vessel’s draught changes.
Revalidation is needed if the route is longer than 24 hours.
Who is responsible for the number and the position of any tugs to be used during a mooring operation?
Pilot will advise the master based upon their knowledge of the berth and port area.
Master will always decide how many and where the tugs are to be used because the vessel pays for them.
The port authority determines the number and position of tugs required.
The tug company will suggest the number and position of tugs based on their experience.
For the same engine revolutions, what happens to a vessel’s water speed in shallow water compared to deep water?
The same as deep water.
Faster than deep water due to less resistance.
It varies depending on the vessel’s design.
Slower than deep water.
A ship’s engine goes from full ahead to full astern. Would the effect on the vessel’s speed be the same in deep and shallow water?
The shallow water will produce a greater deceleration than in deep water because the propeller ‘bites‘ more.
The propeller effectiveness is greatly reduced and therefore the results will be considerably different.
The vessel will decelerate at the same rate in both conditions.
The vessel will stop faster in deep water due to less resistance.
Can anything be done on a vessel with forward speed, to reduce the change in heading caused by a right hand fixed pitch propeller being put astern?
The rudder should be put hard to starboard to reduce the water flow to the left side of the propeller.
Yes, the rudder can be put to port.
The vessel should maintain a straight course without using the rudder.
The engine speed should be reduced to minimize the effect.
A vessel is to be crash stopped without major change to its heading. What is the most effective method to achieve this?
Reduce engine power, use high frequency rudder cycling.
Put the engine full astern and keep the rudder amidships.
Use the bow thruster to assist in stopping.
Increase speed before stopping to reduce momentum.
The rudder is hard over with the engine at full ahead. Will the turning effect of the rudder be changed if the engine is stopped?
Yes, the turning force will be dramatically reduced when the engine is stopped.
No, the turning force applied by the rudder will be maintained within about 90% of the turning force when going full ahead.
The turning effect will remain the same until the vessel loses all forward momentum.
The rudder will have no effect once the engine is stopped.
What would be the effects of a ship passing into shallow water?
The speed is not affected, but more rudder is required to steer the ship.
The ship will experience increased speed due to reduced drag.
The vessel will become more stable and easier to control.
The ship is less responsive to both rudder and propeller.
In a canal without water flow, if a vessel was approaching a bank at an angle, what would be the probable effect on it?
The vessel’s bow is attracted by the bank.
The vessel’s bow is pushed away from the bank.
The vessel will rotate around its center of gravity.
The vessel will come to a complete stop upon reaching the bank.
Why should a Ground Stabilised True Motion radar display not be used for anti-collision purposes?
The ‘aspect’ of the target is confused, so the Regulations for Preventing Collisions cannot be accurately applied.
True motion does not provide the collision risk of targets as only true vectors are available.
True motion displays are not updated frequently enough to assess collision risk.
Ground stabilised displays do not show the vessel’s own speed and heading.
If a DSC distress alert is received on board your ship, what is the first action that should be taken?
Immediately answer the distress message on the correct radio frequency.
Listen for a distress message on the appropriate radio frequency for five minutes.
Notify the captain and prepare to take action.
Check the ship’s position and heading before responding.
What immediate action should be taken if a ship unexpectedly runs aground and stops?
Stop engine(s).
Sound the General Alarm.
Assess the damage and check for leaks.
Notify the coast guard immediately.
You are on a power-driven vessel underway in open water. This vessel is sighted directly ahead. The distance is closing slowly. What action will you take under the International Collision Regulations and why?
The vessel is on a steady bearing and the distance is closing. I will therefore take avoiding action, altering course to starboard and sounding one short blast under rules 14 and 16. I will keep out of her way.
I will maintain my course and speed, as I have the right of way.
I will alter course to port and increase speed to pass ahead of the other vessel.
I am the overtaking vessel and am obliged to keep clear under rule 13.
What does this two flag hoist mean, as mentioned in the International Regulations for Preventing Collisions at sea?
I require medical assistance.
It is a distress signal.
It indicates that I am in a safe harbor.
It means I am requesting a pilot on board.
Which option best completes the following statement? An operator using ECDIS, will notice an out of position navigation buoy because..
…it is coloured orange on an ECDIS display.
…the radar return and ENC buoy symbol will not coincide.
…the buoy will flash a different light pattern than indicated.
…the ECDIS will automatically alert the operator of the discrepancy.
Which of the statements best describes what happens to the sounding figures on an ECDIS chart display, when the safety depth figure is set?
Figures less than the safety depth are highlighted in bold.
There will be alarms activated to let the operator know the depth under keel.
The sounding figures will be removed from the display for safety.
All sounding figures will be displayed in red to indicate danger.
