Your position is LAT 41°15.2'N, LONG 71°50.1'W at 1347. You are turning for 6.9 knots. What is your ETA at Shagwong Reef Buoy "7SR"?
• Time-Speed-Distance formula for nautical miles and knots • How to convert speed in knots to minutes per nautical mile • Reading the chart distance between your position and Shagwong Reef Buoy "7SR"
• First, determine the distance in nautical miles from your given position to Shagwong Reef Buoy "7SR" on the chart. How will you measure that distance accurately? • Once you know the distance, how can you use the speed of 6.9 knots to find the time it will take to get there, in minutes? • After you find the elapsed time, how do you correctly add it to 1347, being careful with minutes rolling over to the next hour?
• Be sure you are using nautical miles, not yards or statute miles, when measuring distance. • Double-check your unit conversion when turning 6.9 knots into minutes per mile (or miles per minute). • Confirm you have correctly added minutes to the start time and handled any hour change properly before choosing the closest listed ETA.
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