TERNAV (quizzes prelim)

Question 1

What is the purpose of an echo sounder on a ship?

Answer 1

To send sound wave pulses for navigation

Question 2

Which of the following is NOT a method of radio navigation?

Answer 2

Deduced Reckoning

Question 3

What is the definition of navigation?

Answer 3

The process of directing the movements of a craft from one point to another safely and at the shortest possible distance.

Question 4

What is the purpose of a passage plan in navigation?

Answer 4

To guide the vessel’s safe passage by determining the most favorable route

Question 5

What is the purpose of piloting in navigation?

Answer 5

To determine the position of a vessel relative to geographic points

Question 6

What is the purpose of RADAR ARPA (AutomaticRadar Plotting Aid)?

Answer 6

To calculate collision avoidance data

Question 7

What is electronic navigation?

Answer 7

Navigation involving the use of electronics in any way

Question 8

Which of the following is NOT a purpose of electronic navigation?

Answer 8

Weather forecasting

Question 9

What is dead reckoning in navigation?

Answer 9

Determining position by advancing a known position for courses and distances

Question 10

What is the main function of a passage plan?

Answer 10

To gather safety and navigation information for a safe voyage

Question 11

How is an ellipsoid uniquely defined?

Answer 11

By specifying the semi-major axis and the flattening.

Question 12

How many primary reference surfaces for the Earth are used in geodetic applications?

Answer 12

(not two)

Question 13

What is the Mercator projection commonly used for in maritime navigation?

Answer 13

To show rhumb lines as straight lines.

Question 14

What type of projection is the Lambert conformal projection?

Answer 14

Conic projection

Question 15

Why is it necessary to project the surface of a sphere onto a developable surface?

Answer 15

-

Question 16

What is the chart datum?

Answer 16

An approximation of the actual mean height of sea level.

Question 17

What is the geoid?

Answer 17

An equipotential surface that would coincide with the mean ocean surface of the Earth if the oceans and atmosphere were in equilibrium.

Question 18

What is the difference between an ellipsoid height and a geoid height?

Answer 18

An ellipsoid height is the distance a given point is above or below the ellipsoid surface, while a geoid height is the distance the geoid surface is above or below the ellipsoid surface.

Question 19

What is the purpose of the geoid in geodetic applications?

Answer 19

To approximate mean sea level (MSL) heights.

Question 20

What is the distinguishing feature of the Mercator projection?

Answer 20

Expansion of both meridians and parallels at the same ratio with increased latitude.