NAV - Form Of The Earth

Question 1

What shape is The Earth? (1)

Answer 1

Oblate spheroid

Question 2

What is the Great Circle? (1)

Answer 2

A circle drawn on the surface of the Earth whose radius and centre are the same as the Earth’s

Question 3

What is the Small Circle? (1)

Answer 3

A circle drawn on the surface of the Earth whose radius and centre are not the same as the Earth’s

Question 4

What is the Equator? (1)

Answer 4

A great circle whose plane is perpendicular to the Earth’s axis of rotation and which divides the Earth into two equal hemispheres

Question 5

What is the Meridian? (1)

Answer 5

A semi-great circle joining the poles

Question 6

What is the Rhumb Line? (1)

Answer 6

A regularly curved line on the surface of the Earth that cuts all meridians at the same angle

Question 7

The Earth’s Lines diagram

Answer 7

Question 8

What are the 4 Cardinal Points? (4)

Answer 8

North
East
South
West

Question 9

Quadrantal Points diagram

Answer 9

Question 10

What distances are measured in time? (2)

Answer 10

• 1 minute = 1nm
• 60 minutes = 1 degree

Question 11

What is a Nautical Mile? (1)

Answer 11

The distance on the surface of the Earth along a Great Circle which subtends an angle of 1minute of arc measured at the centre of the Earth

Question 12

What is the measurements of The Earth’s Circumference? (1)

Answer 12

1 minute = 1nm
1 degree = 60 miles

Answer
60 mins x 360 degrees = 21,600nm

Question 13

What is a Kilometer? (1)

Answer 13

Generally accepted as one 10,000th of the average distance between the equator and either pole

Question 14

What is a Foot? (1)

Answer 14

1ft = 0.3048m or 30.48cm

Question 15

What are the Conversions of Measurements? (4)

Answer 15

• 1 nautical mile = 1.852km
• 1 nautical mile = 6080ft (Mile high)
• 1 statute mile = 5280ft
• 1 kilometre = 3280ft

Question 16

What are the Conversion Factors? (5)

Answer 16

• Feet to metres x 0.3048
• Metres to feet x 3.2808
• Nautical miles to kilometres x 1.852
• Kilometres to nautical miles x 0.5396
• Nautical miles to statute miles x 1.15

Question 17

What are the Conversion Comparisons? (4)

Answer 17

• 41 nautical miles = 76 km
• 41 statute miles = 66 km
• 41 nautical miles = 47 statute miles
• 41 statute miles = 35.5 nautical miles