01 Form of the Earth

In navigation, what is a circle on the earth’s surface whose centre is the centre of the earth?

• a great circle

• a small circle

• a meridian

• an anti-meridian

Is the Equator a great circle?

• YES

• NO

Which of the following best describes a small circle used in earth-based navigation?

• any parallel of latitude, other than the equator

• any parallel of latitude, including the equator

• any parallel of latitude that intersects at a right angle all lines of Meridians, including the Prime Meridian

• any parallel of latitude that intersects at a right angle all lines of Meridians, other than the Prime Meridian

Select the word set that, when inserted into the gaps of this text, produces a TRUE Statement.

When viewed from space above the North Pole, the earth rotates in a (i) _______________direction and the direction towards which it is moving is defined as (ii) _________

• (i) anti clockwise, (ii) East

• (i) anti clockwise, (ii) West

• (i) clockwise, (ii) East

• (i) clockwise, (ii) West

In navigation, what is the word ‘CONVERGENCE’ used to describe?

• the changing angle between great circle tracks and meridians

• the curve of a rhumb line as it approaches the geographic poles

• the increasing horizontal distance between meridians as they move from the geographic poles towards Equator

• the reducing horizontal distance between meridians as they move away from the Equator towards the geographic poles

In which hemisphere is the place 38° 39’ 48” S 177° 58’ 42” E located?

• Northern hemisphere

• Southern hemisphere

What linear distance is equal to 1° of latitude change North or South measured on a meridian?

• 1 nautical mile

• 60 nautical miles

• 15 nautical miles

• 24 nautical miles

Convert 85 US gallons to liters

• 315 liters

• 322 liters

• 345 liters

• 330 liters

Convert 27 kilometers (km) to nautical miles (nm)

• 10.2 nm

• 14.6 nm

• 35.5 nm

• 13.2 nm

What is a ‘rhumb line’?

• a line on the surface of the Earth that crosses all lines of latitude at the same angle

• a line on the surface of the Earth that crosses all lines of longitude at the same angle

• the shortest distance between two points

• the shortest distance between Magnetic North and the Geographic South Pole