🔍 Key Concepts

• Dead Reckoning (DR) position and how to advance it using course and speed over time • Using a Sun line of position (LOP) to correct your DR for a more accurate fix • Understanding how course made good and a celestial LOP interact to shift your final latitude and longitude

💭 Think About

• First, calculate where your DR position would be at 1200 based only on course 286°T and 24 knots from 1030 to 1200. How far (in NM) do you travel in that time, and in what direction? • Think about whether your celestial LOP at 1200 is likely to move your final fix mostly in latitude, mostly in longitude, or some combination of both when compared with your 1200 DR. • Compare the change in latitude and longitude from the 1030 DR to each answer choice: which ones are consistent with your 1200 DR track on 286°T at 24 knots?

✅ Before You Answer

• Double‑check your time interval from 1030 ZT to 1200 ZT and convert it correctly to hours before using the speed–distance formula. • Verify that the change in longitude for the correct option is reasonable for a vessel at about 18°N doing 24 knots on a west-northwest course. • Ensure that the latitude change between 1030 and 1200 in your chosen answer matches the north/south component of a 36 NM (or whatever you compute) run on course 286°T.