Worksheet 323 · Skill 3

Dead reckoning

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1. At 0720 you fix your position 036°T, 1.2 nm from Westfield church spire. You steer 052°T at 5.3 kn until 0740, then 281°T at 6.6 kn until 0800.

   Give the 0800 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  

2. At 0910 you fix your position 320°T, 1.3 nm from Tern Island tower. You steer 252°T at 8.1 kn until 0935, then 200°T at 8.0 kn until 0955.

   Give the 0955 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

3. At 1430 you fix your position 033°T, 3.5 nm from Heron Point Light. You steer 244°T at 7.4 kn until 1455, then 026°T at 5.1 kn until 1510.

   Give the 1510 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 1240 you fix your position 301°T, 3.0 nm from Tern Island tower. You steer 260°T at 8.7 kn until 1310, then 084°T at 6.0 kn until 1355.

   Give the 1355 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  

5. At 1415 you fix your position 264°T, 2.0 nm from Tern Island tower. You steer 212°T at 5.0 kn until 1445, then 330°T at 7.4 kn until 1510.

   Give the 1510 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  

6. At 1315 you fix your position 208°T, 1.5 nm from Tern Island tower. You steer 195°T at 5.8 kn until 1350, then 286°T at 4.5 kn until 1405.

   Give the 1405 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  

7. At 1445 you fix your position 037°T, 3.7 nm from Gannet Rock daybeacon. You steer 224°T at 7.2 kn until 1515, then 288°T at 5.4 kn until 1555.

   Give the 1555 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 1525 you fix your position 047°T, 4.0 nm from Westfield church spire. You steer 124°T at 8.4 kn until 1540, then 220°T at 4.0 kn until 1600.

   Give the 1600 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