🔍 Key Concepts

• Effect of set and drift on course and speed made good • Relationship between time, speed, and distance for a 2-hour run • Difference between speed through the water (engine speed) and speed over ground

💭 Think About

• From 0830 to 1030, how much time do you have, and how does that limit the distance you can travel over the ground? • If the current is setting you west at 1.2 knots, is it helping or hurting your progress along 097°T? How does that change the engine speed you need? • Once you know the required speed over ground along 097°T, how do you combine that with the current vector to find the necessary speed through the water?

✅ Before You Answer

• Compute the time interval correctly from 0830 to 1030 in hours and use ( \text{Speed} = \frac{\text{Distance}}{\text{Time}} ). • Measure or determine the ground distance from the 0830 position to the point abeam of Six Mile Reef Buoy "8C". • Use a current triangle (vector triangle): one side is current (1.2 kn westerly), one is your unknown engine speed (through the water), and the resulting side is the required speed over ground toward the buoy.