🔍 Key Concepts

• Set and drift definitions (set = direction current pushes you, drift = speed of that current) • How to interpret a true bearing to a fixed aid to navigation on your plot • Difference between being on track, right of track, or left of track when comparing observed vs. predicted positions

💭 Think About

• On your intended track line, where did you plan to be at 2200, and where are you actually if Middle Ground Light bears 270°T at 9 nm? • If you plot the dead‑reckoning (DR) position and the observed position from the light, in what direction does the error vector point, and what does that say about set? • From the time and the length of the set/drift vector between DR and observed position, what would the magnitude of the current be?

✅ Before You Answer

• Make sure you are clear on which side of your intended track the observed position lies compared to the DR position • Verify how to draw and label the set and drift vector between DR and fix (tail at DR, head at fix) • Confirm whether there is enough information given in the question to compute a numerical value for drift, or only the direction/side of track.