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This page contains answers to Seagull CES test about Ship Navigation, and serve as a database of questions and answers, using which seafarer can prepare to exams for getting certificate of competence, or just to challenge yourself with knowledge in this theme.

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Amount of questions: 27.

Right answers marked with this sign .

A light is given with the following characteristics: FI W (3+1) 12 s 25 m 12M. Is this:
A white light flashing for 3 seconds, then 1 second up to a total of 12 seconds and having a range of 25 Nautical Miles?
A red light flashing for 12 seconds, having a range of 25 Nautical Miles?
A red light flashing for 3 seconds, then occulting once and having a range of 12 Nautical Miles?
A white light flashing for 12 seconds and having a range of 12 Nautical Miles?

How do you find the Nautical Mile scale on the chart?
By measuring one minute of Latitude.
By measuring one minute of Longitude.
By measuring one degree of Longitude.
By measuring the cosine of one degree of Latitude.
How do you take a running fix?
By measuring the angle between two fixed landmarks and finding the sine of the angle.
By taking bearings from a landmark at time intervals and finding the sine of the angles.
By taking bearings from a landmark at time intervals and measuring the distance covered in the intervals.
By taking the relative bearings from 2 sets of landmarks and plotting the difference.
How long would 15 minutes of longitude be at a latitude of 60° North?
15 NM.
30 NM.
7,5 NM.
60 NM.
How long would one degree of latitude be at a latitude of 30° North?
45 NM.
30 NM.
22,5 NM.
60 NM.
If there were suddenly an immediate danger for both the vessel and its crew, would you send a MAYDAY on:
Channel 06 with Dual Watch?
Channel 06 with 25 Watts output?
Channel 16 with 1 Watt output?
Channel 16 with 25 Watts output?
If you sight the sun’s meridian in the Southern Hemisphere in August, would you then:
Subtract the elevation from 90° and add the declination?
Subtract the elevation from 90° and subtract the declination?
Subtract 90° from the elevation and add the declination?
Subtract 90° from the elevation and subtract the declination?
If you spot a Racon on the radar and try to visually identify its light, would you look for:
Probably a quick flashing red light?
Probably a white isophase light?
Probably a sector of light?
It doesn’t matter?
If your timepiece is correct to within 1 minute of an hour, what would be your margin of error in estimating your Longitude at Latitude 60° North?
Within 7,5 NM.
Within 15 NM.
Within 6 NM.
Within 0,5 NM.
In the unlikely event that a distress situation allows you to send only a very short message, after MAYDAY would you first say:
The number of persons on board?
The nature of the distress situation?
On a route from Santander, Spain (43 36 N, 005 38 W) to Brest, France (48 15 N, 004 46 W) would a Great Circle navigation bring you:
To the West of the Rhumb Line navigation?
To the East of the Rhumb Line navigation?
Exactly the same as the Rhumb Line navigation?
The average time between two High Waters is 12 hours and 25 minutes, because this is the time it takes for:
The sun to be at the opposite side of the moon.
The moon to be at the opposite side of the earth.
The moon to be at its apogee.
The sun and the moon to be on the same side.
What can you find from a single aeronautical RDF?
A bearing.
A hyperbolic LOP.
A range.
What does a Racon help with?
Measuring the distance.
Measuring the relative speed.
Identifying a vessel.
Identifying a seamark.
What does the Doppler log measure?
The speed through the water.
The Speed Over Ground.
The depth of water.
What is a Gnomonic chart?
A chart, where Great Circle lines can be drawn as a straight line.
A chart giving true bearings.
A chart, where Rhumb Line can be drawn as a straight line.
Another type of Mercator projection.
What is the easiest way to find the latitude? By measuring the elevation of:
The moon.
The sun.
Venus.
The Pole star.
What is the Tidal Height?
Twice the tide amplitude.
The range of the tide.
The water above the Lowest Astronomical Tide.
The water above or under the Mean Level (ML).
What made finding the longitude by lunar transit inaccurate?
The ship’s motion.
The lack of an accurate almanac.
The lack of a sextant.
The lack of a reliable chronometer.
What was the Selective Availability?
A method of finding a more accurate position.
The selection of satellites available over the horizon.
A reduction in the system’s accuracy.
A range measuring device.
What was the advantage of the Omega system over its predecessors?
It is more accurate.
It has worldwide coverage.
It works in any weather conditions.
It is cheap to install and to use.
What would be the colour of an IALA starboard hand lateral buoy, as seen when sailing toward land, in Europe?
Green.
Red.
Red and green stripes.
Black and yellow stripes.
Which Beaufort Force is defined as a gale?
Force 7.
Force 8.
Force 9.
Force 10.
Which instrument uses a plumb-line?
The astrolabe.
The back-staff.
The cross-staff.
Who has right of way in a Traffic Separation Scheme?
The inbound vessel.
The outbound vessel.
The vessel coming from the starboard side.
The vessel coming from the port side.
Who ran the Decca system?
The IMO.
The U. S. Department of Defense.
An independent U. S. company.
A British company.
Would you take the morning sun’s azimuth in order to:
Find a Line of Position (LOP)?
Find the sun’s declination?
Find the true North?