At 0030 you alter course and speed to make good 265°T at 10 knots. What is your ETA at a point where Stratford Shoal Middle Ground Light is abeam?
• Speed-Time-Distance relationship using nautical miles and knots • How to determine when an object is abeam of your vessel on a given course line • Using your intended track (265°T at 10 knots) to measure distance along track to the abeam position of Stratford Shoal Middle Ground Light
• On the chart, how do you find the point on your 265°T track where Stratford Shoal Middle Ground Light will lie at 90° to your course (abeam)? • Once you know that along-track distance in nautical miles, how do you convert it to time at a steady 10 knots? • After you get the running time from 0030, what do you have to be careful about when adding minutes to the original time?
• Confirm you are measuring distance along your 265°T track, not straight-line distance to the light • Use the correct formula: Time (hours) = Distance (NM) ÷ Speed (knots) and convert to minutes • Double-check your time addition from 0030 and watch for any hour rollover when adding minutes
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