TERNAV2 (MIDTERM) Flashcards

1
Q

is said to be abeam of the ship, when it comes in line with perpendicular to the ship’s fore and aft centreline on any side of the vessel.

A

landmark or lighthouse

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2
Q

Bearing of that lighthouse when abeam will be either

A

90° to the portside or 90° to the starboard side of ship’s heading (ship’s course) at that moment.

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3
Q

The distance of that lighthouse at this moment (when abeam) is called _

A

beam distance

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4
Q

and bearing is known as

A

‘beam bearing’

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5
Q

BC —

A

Second bearing of light

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6
Q

AD —

A

Course steered between observations

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7
Q

AB = BC =

A

Distance run between first and second observations

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8
Q

BC —

A

Distance from the light at the time of second observation

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9
Q

Distance steamed between first and second observation is the

A

distance from observed object

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10
Q

The procedure is similar to doubling the angle on bow.

A

Four-point bearing on the bow

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11
Q

Distance from the object shall be the distance steamed between first and second observation

A

Four-point bearing on the bow

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12
Q

This method also suffers from the disadvantages that distance from the object is only known when ship is already off that position.

A

Four-point bearing on the bow

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13
Q

We use this process for estimating the distance abeam, at which the ship is going to pass any observed object.

A

Special angles on the bow

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14
Q

gives the distance abeam from the object in advance, enabling us to take a decision regarding safe passing distance etc

A

Special angle method of estimating distance

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15
Q

AD =

A

ship’s course steered

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16
Q

Many ports have provided _to guide mariners safely into harbour, avoiding shoals and other dangers.

A

leading lights or shapes

17
Q

In places where such aids are not provided, the navigator may still be able to select a _ provided by the transit of natural features.

A

leading line

18
Q

When a suitable transit is not available a

A

single danger bearing may be taken from the chart

19
Q

is one of the easiest ways to ensure that your vessel and crew stay in safe water

A

Establishing a danger bearing

20
Q

The effect of wind on the course steered

21
Q

The angle between the course steered and the course made good

22
Q

is estimated by the navigator as so many degrees to port or starboard and necessary allowance made for it in computing the course to steer.

23
Q

are designed mainly for solving Parallel Sailing and Plane Sailing without major calculations

A

Traverse tables

24
Q

For plane sailing, the tables are tabulated from

A

right-angled triangles and cover a distance of up to 600 miles, which is the limit for plane sailing.

25
In _, the traverse tables are named from 0° to 45° at the top of the pages, and 45° to 90° at the bottom of the pages.
Norie’s Nautical Tables
26
These figures of degrees are represented courses in
Plane Sailing and latitude in Parallel Sailing
27
The figure of degree of each table is represented for
latitude
28
The columns with the header D. Long. or D'Long., and Dep., which are normally printed in italics, are used to find the
Departure from a given Different of Longitude (D. Long)
29
For _, these figures of degrees are the courses expressed in appropriate quadrants as _
plane sailing, cardinal compass.
30
The three-figure notation (θ°) course is converted into a
quadrantal notation course (Ω°)
31