🔍 Key Concepts

• Using the distance scale on the chart or trackline to measure remaining distance to North Chesapeake Channel Entrance Buoy "NCA" • The basic speed/time formula: ( \text{Time} = \frac{\text{Distance}}{\text{Speed}} ) • Converting decimal hours into minutes to get a clock time ETA

💭 Think About

• From your last known time fix to NCA, what is the remaining distance along your track? How do you read that distance directly from the chart? • Once you find the travel time in hours at 12 knots, how do you turn the decimal part of an hour into minutes? • After you get the number of minutes to go, what do you add that to—the time of your last fix or an earlier DR time?

✅ Before You Answer

• Be sure your distance is measured along the trackline, not straight-line across shoals or land • Confirm you are using nautical miles and knots so the speed/time formula applies directly • Double-check your time addition, especially when minutes go over 60 and may change the hour