Nav - Form and Direction of Earth

Earth is best described as...

• An oval

• A spheroid

• An oblate oval

• An oblate spheroid

What direction does Earth spin when looking from below (South Pole)?

• anticlockwise

• clockwise

Which of these statements is incorrect?

• A great circle plane passes through the centre of the Earth

• A great circle must pass through the north and south poles

• The Equator is a great circle

• A great circle bisects Earth into two equal parts

Compared to any other circle a great circle has...

• The greatest radius and greatest curvature

• The smallest radius and least curvature

• The greatest radius and least curvature

• The smallest radius and greatest curvature

The shortest distance between two points on Earth is found with a...

• Great circle

• Small circle

• Rhumb line

Which of these are correct?

• Every parallel of latitude is a small circle

• Every meridian of longitude is a small circle

• A small circles plane does not pass through the Earths centre

• A small circle cuts all meridians at the same angle

A rhumb line is...

Select all that apply

• Cuts all meridians at the same angle

• Cuts all parallels at the same angle

• Is the shortest distance between 2 points

• is used for navigation simplicity

The datum for latitude is ____ and reaches a maximum of _____.

• the equator, 180 degrees

• the prime meridian, 180 degrees

• the equator, 90 degrees

• the prime meridian, 90 degrees

1nm is defined as a ____ arc on a great circle

• 1 second

• 1 minute

• 1 degree

• 60 degrees

What is the distance between 30º55'00"N and 10º00'00"S on the 145º00'00"E meridian?

• 2455nm

• 1255nm

• 1255km

• 2455km