Chart Navigation & Plotting · ETA Across Time Zones
A vessel departs at 0800 zone time (+5) and runs 120 nm at 15 kn to a port keeping zone time (+4). The ETA in the destination's zone time is:
- A1600
- B1500
- C1700✓ Correct
- D1800
Explanation
Steaming time = 120 ÷ 15 = 8 hours, arriving 1600 in the departure zone (+5). The destination keeps zone +4, one hour earlier west-to-east, so clocks read one hour later: 1600 + 1 = 1700 destination zone time.
Authority: Bowditch (Pub. No. 9); time and longitude
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