Worksheet 227 · Skill 3

Dead reckoning

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1. At 0710 you fix your position 355°T, 1.7 nm from Kittle water tank. You steer 034°T at 9.7 kn until 0720, then 299°T at 5.0 kn until 0735.

   Give the 0735 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 0955 you fix your position 274°T, 1.6 nm from Tern Island tower. You steer 161°T at 5.3 kn until 1025, then 265°T at 6.9 kn until 1040.

   Give the 1040 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 0800 you fix your position 317°T, 1.4 nm from Kittle water tank. You steer 008°T at 8.5 kn until 0810, then 267°T at 5.3 kn until 0830.

   Give the 0830 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  

4. At 1235 you fix your position 205°T, 2.9 nm from Tern Island tower. You steer 138°T at 7.3 kn until 1245, then 062°T at 4.4 kn until 1255.

   Give the 1255 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 1100 you fix your position 053°T, 2.1 nm from Tern Island tower. You steer 134°T at 7.8 kn until 1125, then 199°T at 4.1 kn until 1205.

   Give the 1205 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 1420 you fix your position 067°T, 2.5 nm from Westfield church spire. You steer 109°T at 4.6 kn until 1455, then 324°T at 7.2 kn until 1515.

   Give the 1515 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 070°T, 4.6 nm from Tern Island tower. You steer 248°T at 7.7 kn until 1520, then 052°T at 9.5 kn until 1535.

   Give the 1535 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 1030 you fix your position 059°T, 2.9 nm from Gannet Rock daybeacon. You steer 214°T at 6.1 kn until 1050, then 355°T at 6.1 kn until 1105.

   Give the 1105 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