Jan 2025 PM TCN
Q.4) A Vessel at Tokyo (35◦39 N, 139◦47 E) intends to sail due east for one day (speed 16 knots, Clocks advanced by one hour) then on a great circle track to San Francisco (37◦48 N; 122◦24 W). Find the maximum latitude arrived during the Great Circle passage.
Answer:
Q.5) Vessel steering a course of 135° T at 24 knots in DR Lat 47° 38’N, Long 030° 17’ W, obtains the following observations worked using the above DR:
| Time | Body | Azimuth | Intercept |
| 1848 | Venus | 257° (T) | 6.6’ towards |
| 1852 | Sirius | 140° (T) | 2.5’ away |
| 1906 | Dubhe | 028° (T) | 4.8’ away |
Find position of the vessel at 1900.
Answer:
Q.6) A morning sight of the Sun taken at 0832 (Zone -4) on 11th October 1992 gave a position, through which the PL passed, of 39° 25’ S, 062° 17’ E. Using an estimated speed of 19 knots on a course of 261° (T), find the GMT and Zone Time of the Sun’s meridian passage and the DR at this time.
Answer:
Q.7 On 14th October 1992, Star Vega bore 270° (T) to an observer in latitude 46° 30’ N. At that instant, another star bore 000° (T) with true altitude 30° 12’. Find the SHA and Declination of that star.
Answer:
