Welcome to your Master 24 Wheelhouse Equipment Assessment Online
Student Assessment Instructions
1. This is a closed book Assessment.
2. The video link between the student and the supervisor is to remain on throughout the assessment.
3. All notes, books and mobile phones are to be removed from the table.
4. Mobile phones are to be turned off and not used during the assessment.
5. Students should read each question carefully before answering.
6. All questions are to be answered.
7. No communication is permitted other than with the Assessment Supervisor.
8. No student may leave the room for the duration of the Assessment.
9. When instructed you may commence the Assessment.
10. To pass, you must obtain a 70% or higher mark.
1. (15 MARKS)
For each of the following displays explain:
i. The displayii. The effect of a course alteration on the heading markeriii. The advantage or disadvantage of each display when taking bearings
a. North up
b. Course up
c. Head up
2. (10 MARKS)
a. Explain the advantage of a variable range marker compared to fixed range rings
b. How is the accuracy of a variable range marker checked
c. Why should the range rings be switched off when not required
d. What is the cause of sea clutter
e. How can sea clutter be reduced
f. Why should the “anti-sea clutter” control not be set too high?
3. (10 MARKS)
Radar Plotting Sheet No. 1 shows two types of unwanted echoes.Radar Plotting Sheet No. 1a. What are these unwanted echoes commonly called, in each case?
b. What is the cause of those unwanted echoes in each case?
c. What control or controls could you use to reduce the effect of these unwanted echoes?
4. (10 MARKS)
Using Radar Plotting Sheet No. 2 calculate the TRUE bearings and find the ranges of echoes marked A, B, C, D, E.
Display mode is Ship’s Head Up.Own Ship’s head: 120o (C)Deviation = 2 o WVariation = 12 o ERange Scale 6 miles
5. (10 MARKS)
a. On a separate sheet of paper - With the aid of suitable sketches show why a gently sloping hill does not return a good radar echo whereas a steep cliff returns a strong echo.
b. Briefly explain how the following affect the strength of a radar echo:
i. target size
ii. target shape
iii. target aspect
iv. composition of target
6. (10 MARKS)a. Identify the transmitting sources of screens A and explain its operation in detail.
b. Identify the transmitting sources of screens B, explain its operation in detail and how you will overcome the effect.
c. Identify the transmitting sources of screens C and explain its operation in detail.
7. (15 Marks)
Your vessel is on a course of 125 T and its speed is 10 knots. At 1200 a contact was observed bearing 085 T at 12nm, at 1205 the bearing was 086.5 T at 9nm, and at 1210 the bearing was 090 T and the range 6nm. Use the Plotting Sheet provided.
Find: CPA, TCPA, BCPA, Course, Speed and Aspect of the target vessel.
8. (10 MARKS)
Radar plotting sheet No. 2 shows echoes of three vessels 1, 2 & 3 observed at different times as shown. None of the vessels are visually seen because of heavy fog.
a. If all three vessels maintain their course and speed which vessels are on a collision course with your vessel?
b. State the action you would take for vessel 1
c. State the action you would take for vessel 2
d. State the action you would take for vessel 3
9. (10 MARKS)
a. A Radar is fitted with controls for Tune, Range, Contrast, Gain, and Brillance.
State the order of adjustment when setting up the display.
b. What determines horizontal beamwidth
c. State the advantage of a narrow horizontal beamwidth
d. Which is larger horizontal or vertical beamwidth
e. How may you improve range discrimination
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