Your vessel departs Montevideo, Uruguay, LAT 34° 40.3' S, LONG 54° 09.1' W (ZD +4), at 1800 zone time, on 15 October. It is bound for New York, LAT 40° 27.5' N, LONG 73° 49.9' W (ZD +5). The distance is 5,749 miles, and you expect to average 20 knots. What is your estimated zone time of arrival?
• Time-Speed-Distance relationship for voyage calculations • Difference between zone time (ZD) at departure and arrival locations • Converting elapsed time from hours to days and hours, then applying it to the departure date/time
• First, how do you calculate the total time of the voyage in hours using the given distance and speed? • Once you know the elapsed time, how do you apply it to the departure zone time to get an estimated arrival time, before worrying about date changes? • After you find the arrival time in terms of one time zone, how does the change from ZD +4 to ZD +5 affect the clock time and possibly the date?
• Be sure to use the correct formula: Time = Distance ÷ Speed, keeping units as miles and knots. • Carefully convert the total hours into whole days plus remaining hours, then add that to 1800 on 15 October. • Double-check the direction of the time zone change (from ZD +4 to ZD +5) and whether you should add or subtract one hour when converting to the destination zone time.
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