Worksheet 178 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 351°T, 1.0 nm from Kittle water tank. You steer 083°T at 7.6 kn until 0955, then 260°T at 8.6 kn until 1035.

   Give the 1035 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 1455 you fix your position 168°T, 1.1 nm from Gannet Rock daybeacon. You steer 322°T at 4.1 kn until 1535, then 232°T at 6.0 kn until 1610.

   Give the 1610 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 1240 you fix your position 248°T, 3.1 nm from Tern Island tower. You steer 220°T at 5.3 kn until 1255, then 081°T at 9.0 kn until 1305.

   Give the 1305 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 0810 you fix your position 001°T, 1.6 nm from Gannet Rock daybeacon. You steer 260°T at 10.0 kn until 0825, then 192°T at 9.8 kn until 0835.

   Give the 0835 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 1330 you fix your position 205°T, 1.6 nm from Gannet Rock daybeacon. You steer 077°T at 5.5 kn until 1345, then 352°T at 6.8 kn until 1405.

   Give the 1405 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  

6. At 1405 you fix your position 011°T, 2.5 nm from Mill stack. You steer 212°T at 4.8 kn until 1425, then 305°T at 7.0 kn until 1445.

   Give the 1445 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  

7. At 0900 you fix your position 039°T, 1.9 nm from Gannet Rock daybeacon. You steer 312°T at 9.9 kn until 0910, then 010°T at 4.4 kn until 0925.

   Give the 0925 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 0925 you fix your position 090°T, 1.4 nm from Heron Point Light. You steer 080°T at 9.4 kn until 0940, then 322°T at 4.6 kn until 1000.

   Give the 1000 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