🔍 Key Concepts

• Set and drift as the difference between dead reckoning (DR) position and observed position (fix) • Using time interval to convert distance between DR and fix into speed in knots • Interpreting the direction of set as where the current is pushing you toward (from DR to fix)

💭 Think About

• From 2000 to 2030, where would your DR position be if there were no current and you simply followed your ordered course and speed? • When you plot the bearings to Sand Shoal Inlet South Light and Cape Charles Light at 2030, where is your actual fix compared to your DR position? • Is the current pushing you generally eastward or westward, and how far in 30 minutes, in nautical miles, does that displacement represent?

✅ Before You Answer

• Be sure you are measuring the line from DR (2000-2030) to the 2030 fix, not the other way around, when getting the set • Convert the distance between DR and fix into drift using: Speed (knots) = Distance (NM) / Time (hours) • Check if the direction of the set matches the general direction of the fix relative to the DR (east vs west) to eliminate wrong options