Worksheet 322 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 268°T, 3.2 nm from Tern Island tower. You steer 189°T at 5.5 kn until 0750, then 279°T at 4.3 kn until 0820.

   Give the 0820 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 0830 you fix your position 322°T, 1.3 nm from Tern Island tower. You steer 053°T at 4.7 kn until 0845, then 234°T at 4.9 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  

3. At 1440 you fix your position 322°T, 2.1 nm from Mill stack. You steer 097°T at 4.8 kn until 1455, then 027°T at 5.3 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  

4. At 1440 you fix your position 196°T, 2.1 nm from Tern Island tower. You steer 123°T at 8.2 kn until 1505, then 267°T at 8.3 kn until 1540.

   Give the 1540 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 0930 you fix your position 051°T, 3.8 nm from Westfield church spire. You steer 140°T at 5.9 kn until 1005, then 238°T at 8.1 kn until 1030.

   Give the 1030 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  

6. At 1045 you fix your position 025°T, 2.4 nm from Kittle water tank. You steer 284°T at 6.5 kn until 1055, then 317°T at 4.2 kn until 1135.

   Give the 1135 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 1100 you fix your position 012°T, 2.1 nm from Mill stack. You steer 312°T at 5.7 kn until 1135, then 352°T at 5.1 kn until 1220.

   Give the 1220 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  

8. At 0925 you fix your position 057°T, 2.9 nm from Gannet Rock daybeacon. You steer 218°T at 9.6 kn until 0945, then 078°T at 8.0 kn until 1005.

   Give the 1005 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