Your 1302 position is LAT 37°14.7'N, LONG 76°22.7'W. You are turning for 9.6 knots. What is your ETA at Trestle C of the Chesapeake Bay Bridge and Tunnel if you follow York River Entrance Channel?
• Using the chart to measure the distance along the York River Entrance Channel from the 1302 position to Trestle C of the Chesapeake Bay Bridge-Tunnel • Converting distance in nautical miles and tenths into time at a given speed using the 60-minute rule • Carefully tracking time of departure (1302) and adding transit time to get an ETA in zone time
• How can you trace your intended track from your 1302 position to Trestle C using the channel buoys and ranges shown on the chart? • Once you know the distance in nautical miles, how do you convert that distance to minutes at a speed of 9.6 knots? • After finding the travel time in minutes, what is the correct way to add it to 1302 so that you don’t make a mistake with the hour change?
• Confirm the distance is measured along the channel track, not straight-line (rhumb line) unless the exam question specifies otherwise • Check that you used the correct speed formula: Time (hours) = Distance (NM) ÷ Speed (knots) • Verify that when converting fractional hours to minutes, you multiply by 60 and keep track of rounding to the nearest minute before adding to 1302
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