You are on a voyage from Halifax, Nova Scotia to Galveston, TX. The distance is 2138 miles, and the speed of advance is 12.5 knots. You estimate 18.0 hours for bunkering enroute at Port Everglades, FL. If you sail at 0648 hours (ZD +4), 12 June, what is your ETA (ZD +5) at Galveston?
• Speed = Distance / Time relationship and solving for total steaming time in hours • Converting between time zones (ZD +4 to ZD +5) and keeping dates straight when adding days • Including bunkering delay as additional time on top of steaming time
• First, how many hours will it take to travel 2138 miles at 12.5 knots? (Be careful with units.) • After you find the steaming time, how do you add the 18.0 hours of bunkering and then convert the total time into days and hours? • When you add this total time to the departure time (0648, 12 June, ZD +4), what adjustments must you make when converting the final result to ZD +5 and crossing multiple midnights?
• Recalculate the steaming time carefully and write it down to at least one decimal place before rounding to hours and minutes. • Separate clearly the steps: (1) steaming time, (2) add bunkering, (3) convert total hours to days + hours, (4) add to departure time, (5) adjust for time zone difference. • After you get a candidate ETA, double-check whether the date and hour make sense given the total number of days at sea plus the bunkering delay.
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