From your 0841 position, you are steering a course of 241°T to the northeasterly inbound channel entrance, your speed is now 15 knots. What is your ETA abeam of buoy "NCA" (LL#375)?
• Speed-Time-Distance relationship for ETA problems • How to convert minutes of time to distance run at a given speed in knots • Reading time on a standard analog watch or exam-supplied clock face when adding minutes
• From 0841, think about how many minutes it will take to reach the point abeam of buoy NCA at 15 knots. What information on your exam chart lets you find that distance? • Once you know the distance from your 0841 position to the abeam position of NCA, how do you convert that distance (in nautical miles) into time at 15 knots? • When you add that running time to 0841, which of the answer choices best matches your calculated ETA?
• Be sure you are using nautical miles, not yards or statute miles, when measuring the distance on the chart. • Double-check that you used the correct speed (15 knots) in the Speed-Time-Distance formula: ( \text{Time (hours)} = \frac{\text{Distance (NM)}}{\text{Speed (knots)}} ). • Confirm you have correctly converted decimal hours to minutes (for example, 0.3 hours is 18 minutes, not 30).
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