Description: Tasks for navigation Task number: A1.1, A1.7 Topic: Celestial Navigation, Compass - Magnetic and Gyro - Activ : Determine compass error (magnetic and gyro) using azimuth choosing a suitable celestial body (Sun/ Stars/ Planets/ Moon). Apply variation to find the deviation of the magnetic compass. Minimum number of times that activity should be recorded: 9 (3 each phase) Sample calculation (Azimuth- Stars): On 05th May 2006 at 11h00m00s UTC, a vessel in position 04°30'N 010°00'W observed Canopus bearing 145° by compass. Find the compass error. If variation was 4.0° East, calculate the deviation. GHA Aries (05d 11h): 028° 10.7' Increment (00m 00s): 000° 00.0' GHA Aries: Longitude (W): 028° 10.7' (-) 010° 00.0' (minus- since longitude is westerly) LHA Aries: SHA Canopus: LHA Canopus: Declination: (+) 018° 10.7' 263° 59.0' 282° 09.7' S 052° 42.1' P 360-282° 09.7'= 77° 50.3' (If LHA>180°, P= 360-LHA) A Tan Latitude/ Tan P A Tan 04° 30' Tan 77° 50.3' A = 0.016960803 S (A is named opposite to latitude, except when hour angle is between 090° and 270°) B Tan Declination/ Sin P B= Tan 052° 42.1' Sin 77° 50.3' B=1.342905601 S (B is always named same as declination) C A+B 1.359866404 S (C correction, A+/- B: If A and B have same name- add, If different name- subtract) Tan Azimuth = 1/ (C X Cos Latitude) Tan Azimuth = 0.737640253 Azimuth S 36.4° E (Azimuth takes combined name of C correction and Hour Angle- If LHA is between 0° and 180°, it is named "west", if LHA is between 180° and 360°, it is named "east") True Azimuth= 143.6° Compass Azimuth= 145.0° Compass Error = 1.4° West Variation 4.0° East Deviation 5.4° West

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