EUROTECH MARITIME ACADEMY, KOCHIPHASE II (FG) - Dec 2014
FUNCTION - NAVIGATION NAVAIDS & COMPASSES
Time : 3 hrs Pass Marks : 50 Total Marks : 100
1. Question 1& 7 are compulsory. Q 1 is to be written on
separate sheet2 Attempt any three from the rest.. 3. All questions
carry equal marks.
1. The axis of a gyrocompass damped in tilt , uncorrected for
speed and course error and damping error, points due North in Lat
61 deg S, when making good a speed of 20.6 kts.What will be the
direction of axis when making good a course of 345 deg at a speed
of 13.3 kts in Lat 61 deg N
2. a) Explain ,where necessary with the help of a neat diagram;
i) Ranging ii) Phasing of an echo sounder b) What is, with respect
to the echo sounder: i) cross noise ii) Aeration iii) Pythagoras
error
3. a) Enumerate the IMO performance standards of SVDR b) Explain
the modules of a VDR and procedure for saving and retrieval of data
in case of an incident
4. a) What is the working principle of GNSS ? Explain errors and
alarms of GPS. b) Describe how DGPS enhances the accuracy of GPS
positions.
5. a) Explain how Doppler Effect is used to measure the speed of
a ship over ground ? State the factors which affect the accuracy of
the speed indicated. b) Differentiate between LRIT and AIS
6. a) List the performance standards of an Auto pilot. b)
Explain the limitations of AIS and precautions during use of AIS
for collision avoidance.
7. Own course 275 (T) at 18 kts. Target
timebearingrange150023512.0 nm150623510.0151223508.0 Find a) CPA
range and time b) Course and speed of target c) Aspect at 1512At
1514, the ctarget is identified as avessel not under command. Own
ship decides to alter course at 1515 so as to ensure a CPA range of
2 nm.Find (d) the course alteration to let the target pass ahead of
own ship and hence (e) the new CPA time.Find (f)the course
alteration required to make the target pass astern of own ship and
hence(g) the new CPA time.State (h), which action (d) or (f) is in
accordance with ROR ***************************
