Navigation school examination



Navigation school examination


Two parts of astro theory navigation exam with a total of 15 questions for No 40 navigators course at No 3 air observers school, Fort Pirie, South Australia.



Two page typewritten document


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NO. 40 NAVIGATORS COURSE. [/underlined]

[underlined] TOTAL TIME 3 HOURS.
ASTRO THEORY. [/underlined]

1. Draw a figure to some convenient scale.
(a) On the plane of the Observers Celestial Horizon.
(b) On the plane of the meridian of the Body. – shewing the P Z X triangle when the observers position is 30 S. 120 W. The body has a declination of N.20° and the L.H.A. is 045°.
(c) Mark in the azimuth and the altitude on figure (a).
Give approimate[sic] values for each.
(d) In figure (a) indicate the prime vertical.
(e) Name the following parts of the traingle.[sic] “Z X” “P X”.
(f) Define the position circle and shew it on the figures.

2. Illustrate with diagrams (a) Parallax in Altitude. (b) Dip (c) Refraction?
(d) the various types of horizons.

3. Shew by means of a diagram, at what times Q correction is minus and plus and when it has a zero and maximum value.

4. An aircraft has a T.A.S. of 300 mph and a gyro wander of 61 per minute. Your D/R position is 12S You observe a body which bears 312 (T) and your aircraft heading is 012(T). What is the amount and sign of the correction you must apply to the sextant altitude under these conditions?

5. In the vicinity of 40S and 110W on the night Dec 28-29th you intend using the Astrograph. What is the setting longitude and the Time Difference which you would use?

6. Give a [underlined] brief [/underlined] description of the [underlined] principle [/underlined] of the Astrograph. A description of the mechanism id[sic] NOT required.

7. What are the time Z T & G M T of the moonset and Sunrise on Oct 30th. 1943 in latitude 43 N 90 W.

8. (a) Define siderial[sic] Hour Angle
Altitude of a body
(b) In what three ways can Celestial Longitude be expressed? Why does one not vary
with change in Observers Terristial[sic] Longitude
(c) Using a diagram only shew that LHAxequals GHA plus SHAX, plus E minus W longitude.

9. Using the planisphere determine 3 stars suitable for a fix on the night of 13th. Sept. 1943. (L.D.) at 0300 hrs L.M.T. Your position is PT. PIRIE.
10. The latitude and longitude of the centre of the position circle about a certain star at 1800 hrs GMT on 3/11/43 is 26 18S 154 25 E.
What is the star?.

11. Tabulate the procedure for locating and identifying any particular star by use of the Astro Compass.

[page break]

[underlined] NO. 40(N) COURSE.

1. You are flying at a height of 5,000’ on track 210 (T) with G/S 120K. Your D/R Position at 1930 hours GMT on 5th Nov. 1943 is 26 18S-65 43 E.: - You take the following sights: -

19 27 30Z HAMAL Hs 39 30’
19 30 30Z ALDEBARAN Hs 40 33’
19 34 30Z SIRIUS Hs 36 16’

Your watch is correct and your sextant has no I.E. What is fix at 19 34 30?

Plot on squared paper provided using scale 1” equals 10 mins of long

2. When flying at 1500 ft in D~,R posn[position] 28 12’N 64 52’W at 23 57 30 Zone time the altitude of POLARIS WAS 29 36’ What was your latitude?. [inserted in pencil] 28/10/43.

3. Calculate but DO NOT PLOT the following sights using chosen position nearest to D/R position.
(a) G.D. 12/11/43. MOON G.M.T. Hs 01 27 56 36° 54’ D/R 38 37S 16 48’W
(b) L.D. 14/12/43 MARS Z.T. Hs 04 07051 23° 45’ D/R 29 24N 149 27’E
(c) G.D. 4~,11/43 ALPHARD G.M.T. Hs 06 33 28 42° 39’ D ~,R 34 07S 045 03’W

4. Establish your latitude from the following sight
L.D. 14/9/43. ZT 000 52 59 D/R 75 58S 179 45W
BODY ACRUX Ho 49 24’



“Navigation school examination,” IBCC Digital Archive, accessed March 1, 2024,

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