090 Navigation

1.     The rotational axis of the Earth runs through the...

• geographic North Pole and on the magnetic south pole.
• magnetic north pole and on the magnetic south pole.
• . geographic North Pole and on the geographic South Pole.
• magnetic north pole and on the geographic South Pole.

2.     Which statement is correct with regard to the polar axis of the Earth?

• . The polar axis of the Earth crosses the geographic South Pole and the geographic North Pole  and is perpendicular to the plane of the equator
• The polar axis of the Earth crosses the magnetic south pole and the magnetic north pole and is  perpendicular to the plane of the equator
• The polar axis of the Earth crosses the magnetic south pole and the magnetic north pole and is  at an angle of 66.5° to the plane of the equator
• The polar axis of the Earth crosses the geographic South Pole and the geographic North Pole  and is at an angle of 23.5° to the plane of the equator

3.     Which approximate, geometrical form describes the shape of the Earth best for  navigation systems?

• Perfect sphere
• . Ellipsoid
• Sphere of ecliptical shape
• Flat plate

4.     Which statement about a rhumb line is correct?

• A rhumb line is a great circle intersecting the the equator with 45° angle.
• The center of a complete cycle of a rhumb line is always the Earth's center.
• The shortest track between two points along the Earth's surface follows a rhumb line.
• . A rhumb line cuts each meridian at the same angle.

5.     The shortest distance between two points on Earth is represented by a part of...

• a small circle.
• . a great circle.
• a rhumb line.
• a parallel of latitude.

6.     The circumference of the Earth at the equator is approximately... See figure (NAV-002)

• . 21600 NM.

• 10800 km.

• 12800 km.

• 40000 NM.

7.     What is the difference in latitude between  A (12°53'30''N) and B (07°34'30''S)?

• 05,19°
• . 20°28'00''
• 20,28°
• 05°19'00''

8.     Where are the two polar circles?

• At a latitude of 20.5°S and 20.5°N
• . 23.5° north and south of the poles
• 20.5° south of the poles
• 23.5° north and south of the equator

9.     What is the distance between the parallels of latitude 48°N and 49°N along a meridian  line?

• 111 NM
• . 60 NM
• 60 km
• 110 NM

10.  What distance corresponds to one degree difference in latitude along any degree of  longitude?

• . 60 NM
• 30 NM
• 60 km
• 1 NM