Worksheet 664 · Skill 3

Dead reckoning

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1. At 0850 you fix your position 013°T, 2.6 nm from Mill stack. You steer 034°T at 5.6 kn until 0905, then 206°T at 6.7 kn until 0930.

   Give the 0930 DR position as the true bearing FROM Mill stack to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Mill stack: ________ °T   Distance: ________ nm  

2. At 1140 you fix your position 197°T, 1.0 nm from Gannet Rock daybeacon. You steer 240°T at 5.3 kn until 1210, then 337°T at 6.6 kn until 1220.

   Give the 1220 DR position as the true bearing FROM Mill stack to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Mill stack: ________ °T   Distance: ________ nm  

3. At 0705 you fix your position 111°T, 2.5 nm from Westfield church spire. You steer 263°T at 9.0 kn until 0715, then 040°T at 8.5 kn until 0735.

   Give the 0735 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

4. At 0855 you fix your position 133°T, 1.0 nm from Westfield church spire. You steer 104°T at 6.3 kn until 0940, then 070°T at 8.9 kn until 1015.

   Give the 1015 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

5. At 1205 you fix your position 006°T, 2.0 nm from Tern Island tower. You steer 135°T at 4.4 kn until 1250, then 341°T at 9.3 kn until 1310.

   Give the 1310 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

6. At 1225 you fix your position 053°T, 3.1 nm from Gannet Rock daybeacon. You steer 301°T at 6.5 kn until 1305, then 138°T at 8.6 kn until 1330.

   Give the 1330 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

7. At 0740 you fix your position 053°T, 2.3 nm from Heron Point Light. You steer 007°T at 5.4 kn until 0815, then 110°T at 8.0 kn until 0830.

   Give the 0830 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

8. At 0845 you fix your position 059°T, 2.1 nm from Westfield church spire. You steer 141°T at 6.2 kn until 0925, then 070°T at 8.5 kn until 0950.

   Give the 0950 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm