Dwatch

60問 • 2年前

問題一覧

It is an IMO-adopted mandatory ship reporting system for vessels passing Singapore and Malacca Straits.

Straitrep

It is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave.

Doppler shift

How many characters is the length for all AIS shipborne equipment capable of receiving and transmitting safety and security related messages?

160 characters

This message is used to inform other ships, the VTS or the harbor that your vessel is carrying dangerous cargoes?

IFM12

On the following statements, which is/are true regarding ship reporting systems? I. If a technical failure prevents a ship from reporting, Master should enter the reason in ship's log. II. Master of ships which contravene mandatory ship reporting requirements may not be liable to prosecution. III. Failure of ship's radio communication equipment, is not considered as a failure to comply with the rules of mandatory reporting.

I, III

To measure the athwartship speed, additional transducers are employed and these are called?

Dual-axis speed logs

What do you call the speed that is referenced with respect to the layer of water or anything floating in the water?

Speed over water

Among the purpose of AIS, which one is the most helpful to the operator?

It indicates where the target is turning

It leads the Blind pilotage organization?

BP Officer

An error of doppler log were the frequency generated by the oscillator must be accurate and constant, any deviation in the frequency will result in the speed indicated being in error:

Error in oscillator frequency

Your vessel is supposed to call port of Sydney, Australia, when the charterers suddenly ordered to change port to Newcastle, what type of report should you send to the VTS in the area?

Deviation Report

It is an integrated information gathering system which collects various Navigational related data to allow for effective traffic management, organization and communication.

VTS

Wheel over positions are drawn through as:

pecked line

What frequency is the AIS based its automatic communication between stations?

Very high frequency (VHF)

During blind pilotage the most essential job to perform is that of?

Look-out duties

This means the navigation of the ship through restricted waters in low visibility with little or no recourse to the visual observation of objects outside the ship.

Blind pilotage

This provides all the necessary information for the radar users and helps in saving a lot of critical time from observing a target to finding the data using radar plotting and calculations.

ARPA

The speed of the ship with respect to the ground or any other fixed object such as fixed buoy or island is called?

Speed over ground

During the interval between transmission and reception, the ship may marginally roll or pitch and thereby the angle of transmission and reception can change, which doppler log error is this?

Error due to ship's motion

Within how many yards of the desired place is the accuracy of blind pilotage is such that a ship can be taken to an open anchorage?

50 yards

What do you call the codes recommended by the organization to use when entering the departure and destination ports in the AIS?

UN/LOCODE

An error of doppler log were transducers should make a perfect angle of 60° with respect to the keel or else the speed indicated will be inaccurate:

Error in transducer orientation

What is the most helpful bridge equipment while doing blind pilotage?

Radar / ARPA

This portrays the actual or true motions of the target and the observing ship.

true motion display

It is fitted on the ship's keel which transmits a beam of the acoustic wave at an angle usually 60° to the keel in the forward direction.

Transducer

How many minutes is the data broadcasted in the normal autonomous and continuous mode?

six minutes

During blind pilotage, what is the advantage of RADAR over the eye?

It gives accurate target range and bearing

What do you call the 9-digit number assigned to a particular ship, and considered as its identity which is used in communication and AIS data?

MMSI

When using two (2) operational radar, it is a prudent practice to set them.

one in short range and one in long range

Doppler log is based on which principle?

Doppler effect

AIS means

Automatic Identification System

An error of doppler log were the velocity of the acoustic wave at the temperature of 16°c and salinity of 3.4% is 1505m/sec. This velocity changes with temperature, salinity or pressure.

Error in Propagation Velocity of the Acoustic Wave

Which of the items below is not included in VTS reporting?

Name of Company

What is the frequency used by Channel 87B?

161.975 MHz

Ship reporting systems are governed by what convention?

SOLAS

A technique used to determine your range or distance to a certain navigational hazard or low water. It is a line drawn parallel to the course and a certain distance used.

Parallel indexing technique

At a basic system level AIS communicates between stations by means of standard (digital) message types. These message types have been agreed within by which international agency?

International Telecommunications Union

Your vessel has arrived in a certain port. upon "finishing up with the engine", what is the first thing you'll do to the AIS?

Change AIS setting to "In Port"

Further ship reporting information can be found in what publication?

ALRS Vol 2 part 1

Your vessel is supposed to depart port of Singapore, what should be sent prior to departure?

Departure report

Doppler log error that is more pronounced on a sloppy bottom:

Error due to sidelobe

These are calculated and plotted on the chart as for visual pilotage

Wheel over positions

These are ship-related information which rarely changes, such as ship's name, callsign.

Static data

The following are guidelines for the implementation of VTS EXCEPT?

Improve Competence of Seafarers

Which class of AIS designed to be used by other vessels, such as leisure and fishing vessels?

Class B

This is the process of monitoring the Radar and making use of all its functions to make a full appraisal of any situation and early detection in order to avoid collision of ships.

Radar watchkeeping

This portrays the motion of a target relative to the motion of the observing ship?

relative motion display

It is the actual speed of the vessel affected by the wind, current, and other external forces:

Speed over ground

Radar clearing ranges are drawn as:

broken lines

An instrument used in ships, to measure ship's relative speed with water, in which it is travelling, using Doppler effects on transmitted/reflected sound waves.

Doppler speed log

What error in the doppler log wherein the difference in the frequencies received by the forward and aft transducers must be measured accurately as any error in this will be directly reflected in the speed of the vessel?

Error due to inaccuracy in the measurement of comparison frequency

What Regulation governs ship reporting systems?

Regulation 11

Which of the following are IMO adopted ship reporting system in place in adjacent UK jurisdictional waters?

MANCHEREP

What is a system which is internal to a GNSS receiver that can determine whether the position fix has been compromised by one or more faulty satellites?

RAIM

What do you call to an arrangement of transducers aimed in opposite directions, as a forward-aft (or port-starboard) pair of Doppler-sonar transducers?

Janus Configuration

The effect of pitching will cause an error in the forward speed, but it has no effect on the athwartship speed. Similarly, rolling will cause an error in athwartship, but not in forward speed, which doppler log error is this?

Error due to the effect of rolling and pitching

These are similarly drawn at the maximum or minimum distances from the radar conspicuous objects to keep the ship clear of dangers.

radar clearing ranges

These are information taken from the ship's own data being used for navigation such as position, SOG and COG.

Dynamic data

These data which is specific to the voyage, such as destination port and estimated time of arrival.

Voyage-related data

Which of the following statement/s is/are true regarding VTS and ship reporting system? I. All adopted ship reporting systems and action to enforce compliance should be consistent with UNCLOS. II. Where two or more Governments have a common interest in a particular area, they should formulate proposals for a coordinated ship reporting system. III. The company/owner of the ship shall comply with the requirements regarding the reporting system.

I, II

Seam 5

Gwen Yuchen · 60問 · 2年前

Seam 5