🔍 Key Concepts

• Using two bearings to obtain a fix and compare it to DR (dead reckoning) position • Determining set (direction of current) and drift (speed of current) from the difference between DR track and actual track made good • Converting from pgc (per gyro compass) to true if needed, and carefully reading whether set is T or pgc

💭 Think About

• From your 0530 DR position, plot the DR position for 0620 using course steered and speed through the water. Then plot the 0620 fix from the two simultaneous bearings. How do these two positions differ? • Draw the current vector from the DR position at 0620 to the actual 0620 fix. Which direction does that arrow point, and how do you express that as a set? • Measure the distance between the DR position and the fix, then divide by the time between 0530 and 0620. What drift does this give you, and which of the answer choices matches both your direction and speed?

✅ Before You Answer

• Be sure you are using the correct time interval between DR and fix when computing drift (in hours, not minutes). • Confirm whether the set must be given in true degrees and adjust from pgc to true if required by the exam conventions. • Verify that you are drawing the current arrow from DR position to the fix, not the other way around.