You are on a voyage from Boston, MA to the South Pass, LA. The distance is 1870 miles, and the speed of advance is 13.6 knots. You estimate 16.5 hours for bunkering enroute at Port Everglades, FL. If you sailed at 0836 hours (ZD +5), 26 February, what was your ETA (ZD +6) at the South Pass?
• Speed = Distance / Time relationship to find voyage duration • Difference between Zone Description (ZD +5 and ZD +6) and how it affects local time • How to add bunkering time to the sea passage time and then convert to date/time
• First, find how many hours it takes to travel 1870 miles at 13.6 knots, then add the bunkering time; what total hours do you get? • From 0836 on 26 February (ZD +5), if you add your total hours, on what calendar date and time do you arrive in ZD +5? • Once you have the ETA in ZD +5, how does changing to ZD +6 affect the clock time (do you add or subtract one hour?)
• Confirm you convert the distance and speed correctly using Time = Distance / Speed with units in nautical miles and knots • Be sure you add the 16.5 hours bunkering after computing sea time, not before • Double‑check the time zone change from ZD +5 to ZD +6 and that you adjust the date correctly when you cross midnight multiple times
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