Aset Notes

Question 1

What is the DP Final setup settling period?

Answer 1

30 minutes.

Question 2

What is surge and sway measured by?

Answer 2

Position Reference Systems (PRS).

Question 3

What is yaw measured by?

Answer 3

Gyro.

Question 4

What is pitch and roll measured by?

Answer 4

-Motion Reference Unit (MRU).
-Vertical Reference System (VRS).

Question 5

What is the Max operating angle of a Taut wire?

Answer 5

30 Degrees.

Question 6

What is the range of the Taut wire system dependent on?

Answer 6

The water depth due to the max angle.

Question 7

What happens if the taut wire exceeds its max operating angle?

Answer 7

Exceeding the operating angle may result in the weight “skipping” along the seabed.

Question 8

What is ‘Bilge Keeling’?

Answer 8

When the Taut wire touches the hull of the vessel.

Question 9

What is ARTEMIS used for?

Answer 9

Shuttle tankers off take.

Question 10

What frequency does ARTEMIS use?

Answer 10

‘X’ Band 3cm.

Question 11

What are the disadvantages of using ARTEMIS?

Answer 11

-Interference can occur when there are other vessels in the vicinity who are also using ‘X’ Band radars.
-It is a 1:1 system.

Question 12

What is the accuracy of ARTEMIS?

Answer 12

-5-6NM.
-5000m.

Question 13

How accurate are Tube Reflectors?

Answer 13

150-200m.

Question 14

How accurate are Prism Reflectors?

Answer 14

1000m.

Question 15

What are the disadvantages of Fanbeam/CyScan?

Answer 15

-Lenses need routine cleaning.
-Bright lights can confuse the system.
-Target swap can occur (boiler suit reflectors).
-Precipitation can cause range errors to occur.

Question 16

What does FMCW stand for?

Answer 16

Frequency, Modulated, Continuous, Wave

Question 17

What frequency does FMCW use?

Answer 17

‘X’ Band 3cm.

Question 18

What is the range of FMCW?

Answer 18

1000m.

Question 19

What is the advantage of using FMCW

Answer 19

Multi-user system with no interference.

Question 20

What is the Horizontal Beam Length of RADASCAN?

Answer 20

360 Degrees.

Question 21

What is the Vertical Beam Length of RADASCAN?

Answer 21

22 Degrees.

Question 22

What is the Horizontal Beam Length of RADIUS?

Answer 22

90 Degrees.

Question 23

What is the Vertical Beam Length of RADIUS?

Answer 23

90 Degrees.

Question 24

How many PRS systems should be used for Class 2/3 vessels?

Answer 24

3 or more.

Question 25

What do follow track and follow sub mean?

Answer 25

The same thing.

Question 26

What happens when there is a system failure?

Answer 26

The system will give thrust inputs based upon the historic data of the model 30 minutes prior to the failure.

Question 27

Who determines what class is required for the project?

Answer 27

The charterer.

Question 28

Can a vessel degrade its class?

Answer 28

No

Question 29

What are CyScan/Fanbeam

Answer 29

Laser Opticals

Question 30

Which DP class must operate with all bus ties open?

Answer 30

Class 3.

Question 31

When should wind sensors be taken out of the system?

Answer 31

When conducting Heli Ops

Question 32

What is PDOP?

Answer 32

Position, Dilution, of Precision

Question 33

How many satellites are needed for global coverage?

Answer 33

24 satellites.

Question 34

How many satellites are required for position fixing?

Answer 34

4 satellites.

Question 35

What is GPS accuracy?

Answer 35

5-10m.

Question 36

What are included in paid GNSS corrections?

Answer 36

-1m -0.2/0.3m -0.1m Transmitted via INMARSAT or Spotbeam

Question 37

What is included in free GNSS corrections?

Answer 37

-IALA (2m) -SBAS (4m) -VHF/UHF/MF (Brazil, Canada).

Question 38

What are the different versions of SBAS?

Answer 38

- US (WAAS). - JPN (MSAS). - EU (EGNOS).

Question 39

What does dual frequency do?

Answer 39

Measures Are Ionospheric Delay.

Question 40

What is the main use of DARPS?

Answer 40

Shuttle tanker take off.

Question 41

What does DARPS stand for?

Answer 41

Differential Absolute & Relative Position Sensor

Question 42

Where should a ultrasound transponder be placed in relation to the vessel

Answer 42

Upwind/Up current.

Question 43

What Gain mode should be used when starting a new operation?

Answer 43

Low Gain.

Question 44

What type of system is UTM?

Answer 44

Coordinate based system.

Question 45

How many UTM zones are there?

Answer 45

60 Zones.

Question 46

Why are false Eastings used?

Answer 46

Because surveyors don't like negative numbers.

Question 47

What percentage of Kalman filter is used to segregate readings?

Answer 47

67%.

Question 48

What does HDOP stand for?

Answer 48

Horizontal Dilution of Precision.

Question 49

What does HiPAP Stand for?

Answer 49

High Precision Acoustic Positioning system.

Question 50

What does an LBL relay?

Answer 50

Range only.

Question 51

What does USBL, SSBL & SBL relay?

Answer 51

Range and Bearing.

Question 52

How long should the UPS battery back-up last after a mains supply failure?

Answer 52

30 minutes.

Question 53

How many PRS' are required for a class2/3 vessel?

Answer 53

3.