IDESS iTest Online for Deck Officers – F1 Maritime Navigation, Operational Level
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Amount of questions: 69.
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__________ is the angular distance between the prime meridian and the meridian of a point on the earth, measured eastward or westward from the prime meridian through 180 degree.
Latitude.
Longitude.
Difference of Latitude.
Difference of Longitude.
The process where a navigator constantly evaluates the ship s position, anticipates dangerous situations well before they arise, and always keeps ahead of the vessel.
Evaluation.
Instruction.
Navigation.
Situation.
__________ is the angular distance from the equator, measured northward or southward along a meridian from 0 degree at the equator to 90 degree at the poles.
Latitude.
Longitude.
Difference of Latitude.
Difference of Longitude.
__________ is the direction in which a vessel is pointed, expressed as angular distance from 000 degree clockwise through 360 degree.
Bearing.
Heading.
Course.
Track.
__________ is the direction from the ship to another ship and/or one terrestrial point/object, expressed as angular distance from 000 degree (North) clockwise through 360 degree.
Bearing.
Heading.
Course.
Track.
____________ termed as latitude and longitude, can define any position on earth.
DLAT.
Coordinates.
Tide and Current.
Altitude.
The difference between the magnetic meridian and the geographical meridian.
Compass Bearing.
Compass Error.
Deviation.
Variation.
The_________ is a great circle midway between the poles.
Equator.
Bearing.
Meridian.
Courses.
The difference between the magnetic compass needle point and the magnetic meridian.
Compass Bearing.
Compass Error.
Deviation.
Variation.
_____________ is the rate of motion, or distance per unit of time.
Speed.
Course.
Bearing.
Time.
It is a compass error caused by the magnetic properties of any metal in the immediate vicinity of the compass.
Variation.
Deviation.
Compass Error.
Magnetic Error.
____________ the unit of speed commonly used in navigation, is a rate of 1 nautical mile per hour.
Centimeter.
Kilometer.
Knots.
Bearing.
It is caused by the difference in position of the Geographic Poles and the Magnetic Poles.
Deviation.
Variation.
Compass Error.
Magnetic Error.
The algebraic sum of deviation and variation.
Deviation.
Variation.
Compass Error.
Magnetic Error.
_____________ is the horizontal direction in which a vessel is steered or intended to be steered, expressed as angular distance from north clockwise through 360.
Bearing.
Course.
Altitude.
Distance.
Tides are the periodic motion of the waters of the sea due to changes in the attractive force(s) of the _____.
Moon and Sun upon the rotating earth.
Moon upon the rotating earth.
Sun upon the rotating earth.
Planets.
A great circle through the geographical poles of the earth.
Equator.
Longitude.
Latitude.
Meridian.
The terrestrial great circle whose plane is perpendicular to the polar axis. It is midway between the poles.
Equator.
Longitude.
Latitude.
Meridian.
The meridian used as the origin for measurement of longitude.
Latitude.
Prime meridian.
Longitude.
Meridian.
A nautical mile is equal to _________meters.
1 600 meters.
6 080 meters.
1 852 meters.
1 500 meters.
A circle on the surface of the earth, parallel to the plane of the equator. It connects all points of equal latitude.
Difference of Latitude.
Parallel of latitude.
Departure.
Latitude.
_____________ difference between the compass heading and the magnetic heading, due to ships construction and ship location.
Deviation.
Application.
Correction.
Intention.
What does RADAR mean?
Radio Distance Apparatus.
Remote Detecting and Range.
Radio Detection And Ranging.
None of the above.
The point on the celestial sphere vertically overhead of an observer _____.
Zenith.
Nadir.
North Pole.
North Point.
The point on the opposite side of the sphere vertically below the observer.
Zenith.
Nadir.
South Pole.
South Point.
Which is NOT a distress signal under the Rules?
Orange-colored smoke.
Red flares.
The repeated raising and lowering of outstretched arms.
International Code Signal \"AA\".
A light signal of three flashes means _________.
\"My engines are full speed astern\".
\"I am in doubt as to your actions\".
\"I am operating astern propulsion\".
\"I desire to overtake you\".
A power driven vessel \"not under command\" at night shall show her sidelights when ______.
making no headway.
making headway.
not at anchor.
moored to a buoy.
A power-driven vessel underway in fog making NO way must sound what signal?
One long blast.
One prolonged blast.
One prolonged and two short blasts.
Two prolonged blasts.
How long is the duration of a PROLONGED BLAST?
4 to 6 seconds duration.
2 to 4 seconds duration.
6 to 8 seconds duration.
8 to 10 seconds duration.
A self-propelled dredger not engaged in dredging but proceeding to a dredging position shall exhibit __________.
not required to show any light but all round white light.
lights of a dredger.
an all-round white light.
lights of a power driven vessel.
A vessel 75 meters in length and restricted in her ability to maneuver is carrying out her work at anchor. What signal should be sounded in restricted visibility?
4 short blasts at intervals of not more than 2 minutes.
5 seconds ringing of a bell and 5 seconds sounding of a gong at intervals of not more than 1 minute.
1 prolonged blast followed by 2 short blasts at intervals of not more than 2 minutes.
5 seconds ringing of a bell at intervals of not more than 1 minute.
A vessel aground must display by day __________ in a vertical line.
three black balls.
two black balls.
two black balls and a black diamond shape in between.
two black diamond shapes and a black ball in between.
A vessel aground must display by night __________ in a vertical line, in addition to the lights required for a vessel at anchor.
two white lights.
three white lights.
three red lights.
two red lights.
A vessel shall be deemed to be ____________ when coming up with another vessel from a direction more than 22.5 degrees abaft her beam and at night she would be able to see only the stern light of that vessel but neither of her sidelights.
overtaking.
crossing.
passing.
meeting.
A vessel at anchor shall display ________ between sunrise and sunset on the forward part of the vessel where it can be best seen.
2 black balls.
1 black ball.
1 red ball.
2 orange and white balls.
A vessel is \"in sight\" of another vessel when ________.
she can be seen well enough to determine her heading.
she can be observed visually or by radar.
she can be observed visually from the other vessel.
her fog signal can be heard.
A vessel is being propelled both by sail and by engines. Under the Rules, the vessel is _______.
considered a power-driven vessel.
considered a \"special circumstance\" vessel.
could not cover under any category.
considered as a sailing vessel.
A vessel is considered \"engaged in fishing\" according to the Rules of the Road, when ________.
showing lights and shapes for a vessel restricted in her ability to maneuver.
using trawling lines.
when a vessel is power driven.
using fishing apparatus that restricts her maneuverability.
A vessel must proceed at a safe speed _______.
in restricted visibility.
at all times.
in congested waters.
during darkness.
A vessel showing the International Code Flag \"A\" is engaged in ________.
mine clearing operations.
dredging.
fishing.
diving operations.
A vessel which is \"restricted in her ability to maneuver\" is one which _____.
has lost steering and is unable to maneuver.
through some exceptional circumstances is unable to maneuver as required by the rules.
due to adverse weather conditions is unable to maneuver as required by the rules.
from the nature of her work is unable to maneuver as required by the rules.
A vessel which is unable to maneuver due to some exceptional circumstances, shall exhibit __________.
when making way at night, a masthead light, sidelights, and a sternlight.
when making way at night, 2 all-round red lights, sidelights, and a sternlight.
during the day, 3 balls in a vertical line.
during the day, 3 shapes, the highest and lowest being balls and the middle being a diamond.
If you are approaching a bend and a whistle signal of one prolonged blast from around the bend, you should answer with a signal of ________.
one prolonged blast.
1 short, 1 prolonged, and 1 short blast.
a long blast.
a short blast.
If you are the stand-on vessel in a crossing situation, you may take action to avoid collision by your maneuver alone. When should this action be taken?
At any time you feel it is appropriate.
Only when you have reached extremis.
When it becomes apparent to you that the give-way vessel is not taking appropriate action.
When you determine that your present course will cross ahead of the other vessel.
The Regulations for Preventing Collision At Sea allows under Rule 2 __________.
crossing the bow of a stand on vessel.
a vessel to sail without operational radar.
a vessel to anchor in a roadstead during emergency.
a departure from the rules to avoid immediate danger.
The rules concerning lights shall be complied within all weathers from sunset to sunrise. The lights _______.
shall be displayed in restricted visibility during daylight hours.
need not be displayed by unmanned vessels.
need not be displayed when no other vessels are in the area.
shall be set at low power when used during daylight hours.
The word \"vessel\" in the Rules includes __________.
sailing ships.
non-displacement.
seaplanes.
All of these.
Two vessel meeting in a \"head on\" situation are directed by the Rules to ______.
alter course to port and pass starboard to starboard.
alter course to starboard and pass port to port.
decide on which side the passage will occur by matching whistle signals.
slow to bare steerageway.
What must a vessel display during the day if she is constrained by her draft?
A cylinder.
A black cone, apex downward.
A black cone, apex upward.
Two black balls in a vertical line.
When shall the stand-on vessel change course and speed?
After the give-way vessel sounds 1 blast in a crossing situation.
When two vessels become less than half a mile apart.
The stand-on vessel may change course and speed at any time as it has the right-of-way.
When the action of the give-way vessel alone cannot prevent collision.
When two vessels are in an overtaking situation, which light does the overtaking vessel see?
Stern light only.
Stern light and a sidelight.
Stern light and the after mast light.
Stern light, sidelight and the after mast light.
______________ is the state of the earth\'s atmosphere with respect to temperature, humidity, precipitation, visibility, cloudiness, and other factors.
Sailing.
Weather.
Celestial.
Azimuth.
______________ refers to the average long-term meteorological conditions of a place or region. All weather may be traced to the effect of the sun on the earth.
Weather.
Sea Condition.
Climate.
Tide and Current.
The rotation of the earth exerts an apparent force which diverts the air from a direct path between high and low pressure areas.
Coriolis force.
Celestial force.
Wind force.
Weather Change.
It is relatively thin shell of air, water vapor, and suspended particulates surrounding the earth. Air is a mixture gas and, like any gas, is elastic and highly compressible.
Weather.
Climate.
Atmosphere.
Pressure.
A standard sea level pressure is __________.
1013.25 millibars of mercury.
1015.25 millibars of mercury.
1018.25 millibars of mercury.
1020.25 millibars of mercury.
It is a visible aggregate of tiny water droplets and/or ice crystals suspended in the atmosphere and can exist in a variety of shapes and sizes.
Smoke.
Rain.
Fog.
Cloud.
It consists of fine dust or salt particles in the air, too small to be individually apparent, but in sufficient number to reduce horizontal visibility and cast a bluish or yellowish veil over the landscape, subduing its colors and making objects appear indistinct.
Advection fog.
Radiation fog.
Haze.
Mist.
It is synonymous with drizzle in the United States but is often considered as intermediate between haze and fog in its properties. If it is heavy, it can reduce visibility to a mile or less.
Haze.
Mist.
Snow.
Rain.
The compass deviation changes as the vessel changes.
Geographical position.
Speed.
Heading.
Longitude.
When reporting wind direction, you should give the direction in __________.
true degrees.
magnetic compass degrees.
relative degrees.
isobaric degrees.
The annual change in variation for an area can be found in __________.
the handbook for Magnetic Compass Adjustment, Pub 226.
the compass deviation table.
the center of the compass rose on a chart of the area.
variation does not change.
Inferior conjunction is possible for __________.
Mercury.
Saturn.
Mars.
Jupiter.
The chart indicates the variation was 3 Deg 45 Min W in 1988, and the annual change is decreasing 6 Min. If you use the chart in 1991 how much variation should you apply?
03 Deg 27 Min E.
03 Deg 27 Min W.
04 Deg 03 Min W.
04 Deg 03 Min E.
The angle measured from the observer\'s meridian, clockwise or counterclockwise up to 180 Deg, to the vertical circle of the body is the __________.
local hour angle.
meridian angle.
azimuth angle.
observer\'s longitude.
Horizontal movement of water is called:
variation.
current.
deviation.
leeway.
To find a magnetic compass course from a true course you must apply __________.
deviation.
variation.
compass error.
deviation and variation.
A vessel heading SSE is on a course of __________.
112.5 Deg.
135.0 Deg.
157.5 Deg.
180.0 Deg.
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About this test
- Total questions69
- DepartmentDeck
- LevelOperational
- SubjectNavigation
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Senior Mate with 12+ years of experience in the international merchant marine.
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- Supervising the work of the crew and assisting the captain in managing the vessel.
- Participation in training of junior crew, ensuring compliance with safety standards.
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October, 15, 2026 200 0
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