What was the current between 0520 and 0600?

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🔍 Key Concepts

• Think about how to determine set and drift (direction and speed of current) from a vessel’s track and log readings over a known time period • Remember that current direction is given as the direction toward which the current flows, in degrees True • Relate the distance the vessel actually made good over the ground vs. what you would expect from her speed through the water to find the drift (speed of current)

💭 Think About

• Between 0520 and 0600, what is the vessel’s course and distance made good over the ground? How does that compare to the ship’s intended course and speed through the water? • From the difference between the dead‑reckoning (DR) position and the fix at 0600, in what direction did the current push the vessel? Is that generally northward or southward, and does that match 358° or 178°? • Is the distance between the DR and fix closer to what you’d expect for 0.8 knot of current or 1.2 knots over a 40‑minute interval?

✅ Before You Answer

• Confirm that you are using True bearings/degrees (000°–359° T) when deciding between 358° and 178° • Compute the approximate set angle from DR to fix using the meridional and longitudinal differences—does it point generally toward 000° or toward 180°? • Calculate or estimate the distance between DR and fix from 0520 to 0600, convert that to knots (using Time = 40 minutes), and compare it to 0.8 vs 1.2 knots to see which is closer.

🔍 Key Concepts

💭 Think About

✅ Before You Answer