Worksheet 228 · Skill 3

Dead reckoning

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1. At 0715 you fix your position 294°T, 2.0 nm from Kittle water tank. You steer 318°T at 4.2 kn until 0800, then 075°T at 4.6 kn until 0815.

   Give the 0815 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 0715 you fix your position 043°T, 4.1 nm from Gannet Rock daybeacon. You steer 281°T at 5.9 kn until 0735, then 083°T at 4.5 kn until 0750.

   Give the 0750 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 1315 you fix your position 176°T, 1.1 nm from Gannet Rock daybeacon. You steer 267°T at 9.3 kn until 1355, then 100°T at 5.1 kn until 1435.

   Give the 1435 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 1520 you fix your position 003°T, 0.8 nm from Kittle water tank. You steer 334°T at 4.4 kn until 1535, then 023°T at 5.2 kn until 1555.

   Give the 1555 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 0745 you fix your position 086°T, 2.6 nm from Westfield church spire. You steer 062°T at 8.0 kn until 0820, then 313°T at 9.7 kn until 0830.

   Give the 0830 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 1120 you fix your position 246°T, 2.3 nm from Tern Island tower. You steer 218°T at 4.9 kn until 1140, then 092°T at 6.7 kn until 1200.

   Give the 1200 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 1515 you fix your position 053°T, 1.6 nm from Gannet Rock daybeacon. You steer 264°T at 7.4 kn until 1525, then 037°T at 8.2 kn until 1600.

   Give the 1600 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 1255 you fix your position 219°T, 3.2 nm from Tern Island tower. You steer 165°T at 8.7 kn until 1310, then 233°T at 8.0 kn until 1320.

   Give the 1320 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