Fixes

Question 1

How would check your echo-sounder?

Answer 1

Leadline

Question 2

How would you fix your position using HSA?

Answer 2

Measure angles between three objects and then use a station pointer to get a fix

Question 3

How would you fix your position using VSA?

Answer 3

1. Take bearing of object and find its height (chart or admiralty list of lights and fog signals) taken from MHWS.

2.Get a VSA using a sextant.

3. Insert height and VSA into Norries table to get a range. (There is also a mathematical formula that can be used.)
4. Corrections are to be made for HoT, HoE and sextant index error.

Question 4

What are som ways to fix your position? (9)

Answer 4

3-point fix
GPS
Radar range and bearing using VRM&EBL
3 Radar ranges
Dipping distances
Bearing and depth sounding using contour lines
VSA
HSA
Running fix

Question 5

How often would you fix your position?

Answer 5

Depending on the ship’s speed & proximity to danger

At least half the time it would take before running in to danger