Worksheet 719 · Skill 3

Dead reckoning

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1. At 1115 you fix your position 136°T, 1.5 nm from Westfield church spire. You steer 056°T at 5.0 kn until 1135, then 265°T at 5.0 kn until 1150.

   Give the 1150 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 1245 you fix your position 297°T, 4.4 nm from Tern Island tower. You steer 165°T at 8.1 kn until 1330, then 010°T at 7.3 kn until 1410.

   Give the 1410 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 1030 you fix your position 053°T, 2.6 nm from Mill stack. You steer 279°T at 9.8 kn until 1055, then 089°T at 5.9 kn until 1110.

   Give the 1110 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  

4. At 1515 you fix your position 063°T, 1.5 nm from Westfield church spire. You steer 195°T at 9.0 kn until 1525, then 078°T at 7.6 kn until 1555.

   Give the 1555 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  

5. At 0850 you fix your position 350°T, 0.8 nm from Gannet Rock daybeacon. You steer 010°T at 5.0 kn until 0905, then 205°T at 9.1 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  

6. At 1545 you fix your position 003°T, 2.3 nm from Mill stack. You steer 207°T at 7.1 kn until 1555, then 104°T at 8.0 kn until 1605.

   Give the 1605 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  

7. At 1145 you fix your position 058°T, 1.2 nm from Heron Point Light. You steer 013°T at 9.1 kn until 1215, then 125°T at 7.8 kn until 1250.

   Give the 1250 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 0805 you fix your position 090°T, 1.8 nm from Westfield church spire. You steer 198°T at 4.3 kn until 0825, then 087°T at 8.2 kn until 0910.

   Give the 0910 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