Worksheet 435 · Skill 3

Dead reckoning

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1. At 0915 you fix your position 058°T, 3.4 nm from Gannet Rock daybeacon. You steer 282°T at 4.7 kn until 0945, then 154°T at 4.3 kn until 0955.

   Give the 0955 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 1435 you fix your position 068°T, 2.5 nm from Westfield church spire. You steer 337°T at 5.0 kn until 1510, then 102°T at 5.2 kn until 1530.

   Give the 1530 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  

3. At 1030 you fix your position 222°T, 2.1 nm from Tern Island tower. You steer 150°T at 5.8 kn until 1110, then 317°T at 6.5 kn until 1120.

   Give the 1120 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  

4. At 0805 you fix your position 288°T, 2.6 nm from Tern Island tower. You steer 233°T at 8.3 kn until 0820, then 138°T at 5.5 kn until 0905.

   Give the 0905 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  

5. At 1450 you fix your position 254°T, 2.8 nm from Gannet Rock daybeacon. You steer 268°T at 9.1 kn until 1500, then 342°T at 4.8 kn until 1530.

   Give the 1530 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 1300 you fix your position 029°T, 3.4 nm from Gannet Rock daybeacon. You steer 147°T at 8.2 kn until 1310, then 356°T at 6.4 kn until 1330.

   Give the 1330 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  

7. At 0930 you fix your position 061°T, 2.1 nm from Gannet Rock daybeacon. You steer 211°T at 5.1 kn until 0940, then 277°T at 4.3 kn until 0955.

   Give the 0955 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 0840 you fix your position 047°T, 1.7 nm from Kittle water tank. You steer 279°T at 5.3 kn until 0900, then 044°T at 7.0 kn until 0920.

   Give the 0920 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