The Sextant

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# The Sextant - PowerPoint PPT Presentation

The Sextant. Quiz Q & A. Junior Navigation Chapter 2. 1. When reading sextant altitude, in what order are degrees, minutes, and tenths of minutes read? Degrees Minutes Tenth of Minutes. 1 st. 2 nd. 3 rd.

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## The Sextant

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Presentation Transcript

The Sextant

Quiz

Q & A

Chapter 2

1. When reading sextant altitude, in what order are degrees, minutes, and tenths of minutes read?

Degrees

Minutes

Tenth of Minutes

1st

2nd

3rd

2. When timing sights, in what order are hours, minutes, and seconds read from the watch?

Seconds

Minutes

Hours

1st

2nd

3rd

3. Before taking sights on the Sun, you sight the horizon and align the direct and reflected images of the horizon. Your Sextant reading is 1.8' on the arc.

• What is the IE?
• b. What is the IC?

+1.8'

-1.8'

4. Before taking sights on the Sun, you sight the horizon and align the direct and reflected images of the horizon. Your Sextant reading is 58.2' off the arc.

• What is the IE?
• b. What is the IC?

-1.8'

+1.8'

5. You need to use the shade glasses on the sextant when taking sights on the sun.

a. True

b. False

6. You take a run of sights on the Sun with the following times of sights and sextant altitudes. Which of the sights are probably erroneous?

WT hs

17-42-33 27° 01.4'

17-43-12 26° 57.8'

17-43-52 26° 58.7'

17-44-27 26° 50.1'

17-44-49 26° 50.0'

17-45-17 26° 45.8'

Hint: Plot the run of sights [See next slide for plot]

Plot of hs versus WT

hs

Time

WT

7. What is the purpose of "swinging the arc" when taking a sight with a sextant?

a. To help obtain a clear view of the horizon.

b. To be sure that the sextant is horizontal at the time of the sight.

c. To help focus the body in the sextant telescope.

d. To be sure that the sextant is vertical at the time of the sight.

### The Sextant

End of Quiz Q & A