Lighthouses in the Sky
Quiz
Q&A
Junior Navigation
Chapter 1
1
Q1
1. If two observers at different DR positions
measure the altitude of the same celestial
body at the same time,
a. the observer closer to the GP of the body
measures the larger altitude.
b. the observer closer to the GP of the body
measures the smaller altitude.
c. both observers measure the same
altitude.
d. the positions of the observers relative to
the GP cannot be determined because the
azimuths from each observer are not
given.
2
Q2
2. Polaris (the North Star) is located
exactly over the earth's north
geographic pole.
a. True
b. False
3
Q3
3. The vertical angle measured with a
sextant between a celestial body and
the horizon is called:
a. azimuth.
b. intercept.
c. altitude.
d. co-altitude.
4
Q4
4. A navigator determines the altitude
of the sun to be 37°26.1'. What is the
distance in nautical miles between
the navigator's position and the GP of
Sun? 3,153.9nm
Solution:
90 ° - 37°26.1´ = 52° 33.9´
52° x 60nm/° = 3120.0nm
+ 33.9' x 1nm/' = +33.9nm
3,153.9nm
5
Q5
5. The difference between the
calculated altitude (Hc) and the
observed altitude (Ho) is called:
a. azimuth.
b. co-altitude.
c. altitude.
d. intercept.
6
Q6
6. The method used in plotting a
celestial LOP is called "the altitudeintercept method."
a. True
b. False
7
Q7
7. The geographical position (GP) of a
body is defined as the point on the
surface of the earth directly beneath
the center of the body.
a. True
b. False
8
Q7
Lighthouses in the Sky
End Of Quiz
Q&A
Junior Navigation
Chapter 1
9