Worksheet 31 · Skill 3

Dead reckoning

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1. At 1155 you fix your position 073°T, 4.2 nm from Tern Island tower. You steer 218°T at 8.2 kn until 1220, then 129°T at 5.8 kn until 1235.

   Give the 1235 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 0720 you fix your position 209°T, 1.9 nm from Gannet Rock daybeacon. You steer 053°T at 4.9 kn until 0755, then 204°T at 5.1 kn until 0825.

   Give the 0825 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

3. At 0920 you fix your position 089°T, 1.7 nm from Tern Island tower. You steer 046°T at 4.1 kn until 0940, then 083°T at 4.7 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  

4. At 1150 you fix your position 072°T, 1.9 nm from Heron Point Light. You steer 041°T at 5.9 kn until 1230, then 234°T at 5.8 kn until 1305.

   Give the 1305 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  

5. At 1255 you fix your position 053°T, 3.4 nm from Tern Island tower. You steer 181°T at 8.0 kn until 1320, then 108°T at 5.9 kn until 1330.

   Give the 1330 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 1225 you fix your position 145°T, 2.3 nm from Tern Island tower. You steer 296°T at 4.4 kn until 1245, then 265°T at 7.0 kn until 1325.

   Give the 1325 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  

7. At 1045 you fix your position 036°T, 2.3 nm from Gannet Rock daybeacon. You steer 326°T at 7.0 kn until 1100, then 117°T at 7.1 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  

8. At 0845 you fix your position 068°T, 2.6 nm from Heron Point Light. You steer 065°T at 4.9 kn until 0910, then 332°T at 5.1 kn until 0935.

   Give the 0935 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