/
Maritime Navigation Essentials
Save to my account
Sign up
Maritime Navigation Essentials
Marine Navigation Essentials
Study
1
Question
When the body is on the rational horizon, what is its zenith distance?
Answer
The zenith distance of a body on the rational horizon is 90 degrees.
2
Question
Under what conditions can the apparent wind be zero?
Answer
The apparent wind can be zero when the true wind is from astern and equal to the ship's speed.
3
Question
What does a buoy with alternating red and white vertical stripes indicate in the IALA A and B Buoyage Systems?
Answer
A buoy with alternating red and white vertical stripes indicates that there is navigable water all around, known as a safe water mark.
4
Question
If your vessel is dragging her anchor in a strong wind, what should you do?
Answer
If your vessel is dragging her anchor in a strong wind, you should drop another anchor.
5
Question
In the IALA Maritime Buoyage System, what is the purpose of a red and white vertically-striped buoy?
Answer
In the IALA Maritime Buoyage System, a red and white vertically-striped buoy is used as a safe water mark.
6
Question
What is the actual speed of a vessel in nautical navigation terms?
Answer
The actual speed of the vessel refers to the speed over the ground (SOG) or the speed through the water (STW) depending on the context of the navigation.
7
Question
What are the different methods of measuring speed over the surface of the Earth at any given time?
Answer
1. Speed over the ground 2. Speed of advance 3. Speed on the water 4. Speed of intention
8
Question
What method of position fixing is preferred for best accuracy and reliability?
Answer
Taking a radar range and visual bearing.
9
Question
In which direction do major ocean currents typically flow in the Northern Hemisphere?
Answer
Clockwise around the North Atlantic Oceans.
10
Question
What is the effect of bank suction and cushion effect on a vessel proceeding along the right bank of a narrow channel?
Answer
A vessel may start to sheer due to bank suction and cushion effect.
11
Question
What actions should be taken if a vessel starts to sheer in a narrow channel due to bank suction on the right bank?
Answer
You should increase speed and put the rudder right full.
12
Question
What is the impact of the Gulf current on ocean current patterns in the Northern Hemisphere?
Answer
The Gulf current flows clockwise, contributing to the clockwise flow of ocean currents around the North Atlantic.
13
Question
What should a captain do if the vessel is sheering but is in a right-handed screw vessel?
Answer
The captain should increase speed, put the rudder right full, then manage the rudder to maintain control.
14
Question
What is the significance of taking several radar bearings while navigating?
Answer
Taking several radar bearings, either clockwise or counterclockwise, helps enhance positional accuracy depending on the surrounding current conditions.
15
Question
What effect does the cushion effect have on vessel navigation?
Answer
The cushion effect can cause loss of control or unpredictable movements in the vessel, making navigation more difficult in narrow channels.
16
Question
How should a captain respond if a vessel sheers to the left (or toward the bank) while navigating a narrow channel?
Answer
The captain should stop engines and put the rudder left full to counteract the sheering.
17
Question
What action should be taken when instructed to 'decrease speed and put the rudder right full'?
Answer
Decrease the vessel's speed and steer the rudder fully to the right to change direction.
18
Question
What is the sustained surface wind speed of a Tropical Depression?
Answer
A Tropical Depression has a sustained surface wind speed of 33 knots.
19
Question
How much shorter is a sidereal day compared to a solar day?
Answer
A sidereal day is shorter than a solar day by about 3 minutes and 56 seconds.
20
Question
What common occurrence happens when a vessel is running into shallow water?
Answer
The phenomenon known as 'squat' will cause a decrease in bottom clearance and a decrease in draft.
21
Question
In the IALA Buoyage System, what is the color pattern of an East Cardinal Mark?
Answer
An East Cardinal Mark is characterized by a black band above a yellow band.
22
Question
What should a navigator be alert for when a ship is steaming at night with the gyro-pilot engaged?
Answer
The navigator should closely monitor for any changes in course or heading to ensure the ship remains on the correct track.
23
Question
What is 'squat' in the context of maritime navigation?
Answer
'Squat' is the effect that occurs when a vessel moves into shallow water, causing a decrease in the vessel's bottom clearance and an increase in its draft due to the suction effect.
24
Question
What is the significance of the IALA Buoyage System in navigation?
Answer
The IALA Buoyage System provides a standardized method for marking navigational hazards and safe waters, which helps to guide vessels safely through coastal and inland waters.
25
Question
What are the typical causes of a vessel experiencing squat?
Answer
Squat typically occurs due to the interaction between the vessel's hull and the seabed in shallow waters, where the water cannot flow under the hull freely, causing a drop in the vessel’s stern and a rise in the bow.
26
Question
What are the primary colors and configurations of a Cardinal Mark in maritime buoyancy?
Answer
Cardinal Marks are identified by their specific color configurations that indicate safe water direction; North Cardinal Marks feature black and yellow, East has a black band above yellow, South has yellow above black, and West has a yellow band above a black band.
27
Question
What is the first action to take if your vessel's course is slowly changing to the right?
Answer
Switch to hand steering.
28
Question
What should you do if your vessel's course is slowly changing to the right?
Answer
First, switch to hand steering, call the Master, shift steering to the emergency steering station, or maintain course on the gyro pilot while making as much speed as possible.
29
Question
In the Northern Hemisphere, if your vessel is in a hurricane's navigable semicircle, where should it be positioned with respect to the wind?
Answer
The vessel should be positioned on the starboard quarter, holding course and making as much speed as possible.
30
Question
What should you do if your vessel is on the port quarter in a hurricane's navigable semicircle?
Answer
If on the port quarter, maintain course and ensure that the hurricane has passed.