At 0327 ZT on 29 May, your DR position is LAT 25° 00' N, LONG 64° 15' W. You are steering 270° T at a speed of 13.6 knots. What is the zone time of sunrise?
• Use the Nautical Almanac sunrise tables for the correct date and latitude • Convert from GMT (UT) to Zone Time (ZT) using the proper zone description (ZD) for your longitude • Apply a DR longitude correction if required between 0000 and the time of sunrise
• From the DR position and course/speed, estimate the longitude at the time of sunrise, not just at 0327 ZT—how far will you move west by then? • Determine the correct time zone description from the given longitude (east or west of Greenwich, and how many whole hours). • Once you get sunrise in GMT/UT from the Almanac, how do you correctly apply the ZD sign to obtain ZT?
• Confirm the date and latitude band you would use in the sunrise table (29 May, 25° N) • Double‑check the sign and value of ZD for about 64° W longitude (is it minus or plus, and how many hours?) • Verify whether you must adjust for change in longitude due to DR run between 0000 and sunrise before choosing the closest listed ZT option
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