Your 2215 position is LAT 41°05.4'N, LONG 72°59.4'W. You are making 15 knots. What is your ETA at Twenty-Eight Foot Shoal Lighted Buoy (LAT 41°09.3'N, LONG 72°30.5'W)?
• Speed-Time-Distance relationship for finding ETA • Converting a difference in latitude and longitude to distance on a Mercator chart • Using nautical miles (NM) and knots correctly
• How can you find the distance between your 2215 position and the buoy using the chart scale or latitude scale? • Once you know the distance in nautical miles, how do you convert that distance to time at 15 knots? • After you find the travel time, how do you correctly add minutes to 2215, watching for the hour change?
• Confirm the distance in NM between the two positions from the chart (don’t try to compute it only from numbers in the question). • Verify your time in hours and minutes matches the formula: Time (hours) = Distance (NM) ÷ Speed (knots). • Carefully add the travel time to 2215, making sure you handle any carry-over of minutes to the next hour.
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