Amplitude Quiz

What is the amplitude of a heavenly body?

• The distance between two points

• The arc of horizon contained between the position of the body when rising or setting and the East or West point of the horizon

• The speed of the body in motion

• The brightness of the body in the sky

How is the amplitude of a heavenly body named?

• North/South xxx° East/West

• East/West xxx° North/South

What is the formula to calculate amplitude?

• Amplitude = sin(Declination) / cos(Latitude)

• Sin Amplitude = cos(Declination) / sin(Latitude)

• Amplitude = sin(Declination) x sin(Latitude)

• Sin Amplitude = sin(Declination) / cos(Latitude)

How is compass error checked using amplitude?

• By observing the brightness of the body

• By calculating the speed of the ship

• By measuring the distance between two points

• By comparing true bearing and compass bearing

What is the purpose of the amplitude in navigation?

• To check compass error quickly

• To measure the distance traveled by the ship

• To calculate the speed of the ship

• To determine the brightness of the stars

How is the amplitude of a heavenly body named if it is rising?

• South

• North

• East

• West

How is the amplitude of a heavenly body named for Sun PM amplitude?

• South

• North

• East

• West

The North or South amplitude angle for the bearing of the body is following which direction?

• Latitude

• Longitude

• Declination

• Azimuth

Quizzez Rev Qn 1

From the following information,

 

Date at ship: 06 January 2001

DR position: 12° 34’S, 135° 35’W

SUN AM amplitude: 112°(G)

If the course to steer is 080° T, Calculate the Gyro Course to steer.

[Eg. If answer is 045.0°(G), please fill in the answer is 045.0]

Quizzez Rev Qn 2

From the following information,

 

Date at ship: 07 January 2001

DR position: 22° 50’N, 280° 50’ E

SUN PM amplitude: 245.5°(G)

If the course to steer is 145° T, Calculate the Gyro Course to steer.

[Eg. If answer is 105.5°(G), please fill in the answer is 105.5]