SSEE; distance 16 miles. The deviation for the direction of the ship's head (NW) at the time of taking the departure was 16° W. The set of the current, which affects the ship during her entire cruise, from noon to noon, is S E by E (magnetic) 39 miles. The courses and distances sailed are as follows. Find the latitude and longitude in, at noon May 3. Adding together the distances for each course and placing the whole in form of a traverse, the result is as follows: EXAMPLE 2.-On August 24, at noon, a ship, by astronomical observations, was in latitude 23° 30′ S and longitude 15° 20′ E; and at noon on August 25, by similar observations, she was found to be in latitude 25° 30.1' S and longitude 15° 36.4′ E. Between these periods she sailed as by the following log-book account. The first 4 hours a current set the ship 2 knots an hour ENE (magnetic); at 8 o'clock A. M. a tidal stream of unknown direction and velocity was encoun-tered. Find the latitude and longitude in by dead reckoning at noon August 25, the course and distance made good, and the set and velocity of the tidal stream experienced. SOLUTION.-Correct the courses in the usual manner and add together the distances for each course. Remember to correct the current for variation only, since its given set is magnetic. The traverse formed from these courses and distances follows. |