Worksheet 233 · Skill 3

Dead reckoning

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1. At 0825 you fix your position 223°T, 1.4 nm from Gannet Rock daybeacon. You steer 332°T at 6.9 kn until 0835, then 142°T at 5.7 kn until 0855.

   Give the 0855 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  

2. At 0755 you fix your position 058°T, 3.2 nm from Heron Point Light. You steer 008°T at 5.3 kn until 0835, then 202°T at 7.0 kn until 0900.

   Give the 0900 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 1540 you fix your position 022°T, 1.5 nm from Tern Island tower. You steer 070°T at 7.5 kn until 1550, then 279°T at 7.1 kn until 1630.

   Give the 1630 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  

4. At 1310 you fix your position 234°T, 1.9 nm from Gannet Rock daybeacon. You steer 274°T at 9.1 kn until 1340, then 311°T at 4.9 kn until 1410.

   Give the 1410 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  

5. At 1135 you fix your position 337°T, 1.5 nm from Gannet Rock daybeacon. You steer 071°T at 4.1 kn until 1215, then 231°T at 5.9 kn until 1250.

   Give the 1250 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 0755 you fix your position 044°T, 1.9 nm from Kittle water tank. You steer 291°T at 9.2 kn until 0820, then 223°T at 4.7 kn until 0840.

   Give the 0840 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 1330 you fix your position 064°T, 2.6 nm from Gannet Rock daybeacon. You steer 191°T at 4.5 kn until 1340, then 037°T at 8.5 kn until 1350.

   Give the 1350 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  

8. At 1435 you fix your position 254°T, 3.2 nm from Tern Island tower. You steer 083°T at 8.8 kn until 1445, then 195°T at 6.5 kn until 1505.

   Give the 1505 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