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? Tenth of Minutes 1st 2nd 3rd

2. When timing sights, in what order are hours, minutes, and seconds read from the watch? 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' Bad Sight Bad Sight Hint: Plot the run of sights [See next slide for plot]

Plot of hs versus WT hs Time Bad Sight Bad Sight 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.

End of Quiz Q & A Junior Navigation Chapter 2 The Sextant End of Quiz Q & A Junior Navigation Chapter 2