Worksheet 174 · Skill 3

Dead reckoning

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1. At 1430 you fix your position 280°T, 1.4 nm from Gannet Rock daybeacon. You steer 200°T at 7.9 kn until 1455, then 334°T at 8.4 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  

2. At 1525 you fix your position 222°T, 3.1 nm from Tern Island tower. You steer 319°T at 9.7 kn until 1550, then 236°T at 9.4 kn until 1600.

   Give the 1600 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 1250 you fix your position 066°T, 2.0 nm from Heron Point Light. You steer 346°T at 4.3 kn until 1335, then 286°T at 7.3 kn until 1345.

   Give the 1345 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 0845 you fix your position 158°T, 3.0 nm from Tern Island tower. You steer 013°T at 8.1 kn until 0905, then 122°T at 9.5 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  

5. At 1005 you fix your position 027°T, 2.0 nm from Heron Point Light. You steer 017°T at 5.0 kn until 1015, then 256°T at 6.1 kn until 1035.

   Give the 1035 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 0830 you fix your position 072°T, 2.9 nm from Westfield church spire. You steer 013°T at 5.3 kn until 0855, then 112°T at 7.1 kn until 0905.

   Give the 0905 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 1500 you fix your position 080°T, 1.9 nm from Westfield church spire. You steer 102°T at 8.6 kn until 1515, then 143°T at 7.8 kn until 1525.

   Give the 1525 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 0825 you fix your position 353°T, 1.1 nm from Gannet Rock daybeacon. You steer 018°T at 9.9 kn until 0835, then 330°T at 5.7 kn until 0900.

   Give the 0900 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