Worksheet 361 · Skill 3

Dead reckoning

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1. At 0800 you fix your position 030°T, 0.8 nm from Heron Point Light. You steer 057°T at 9.4 kn until 0825, then 205°T at 8.3 kn until 0845.

   Give the 0845 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  

2. At 1225 you fix your position 082°T, 3.0 nm from Gannet Rock daybeacon. You steer 325°T at 4.1 kn until 1255, then 025°T at 4.1 kn until 1330.

   Give the 1330 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 1450 you fix your position 093°T, 1.3 nm from Gannet Rock daybeacon. You steer 056°T at 7.1 kn until 1500, then 188°T at 5.8 kn until 1525.

   Give the 1525 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  

4. At 1030 you fix your position 094°T, 1.8 nm from Gannet Rock daybeacon. You steer 264°T at 5.6 kn until 1040, then 073°T at 7.8 kn until 1055.

   Give the 1055 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 1245 you fix your position 021°T, 2.4 nm from Mill stack. You steer 133°T at 4.1 kn until 1305, then 021°T at 6.9 kn until 1315.

   Give the 1315 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 0900 you fix your position 288°T, 1.9 nm from Tern Island tower. You steer 249°T at 6.8 kn until 0920, then 291°T at 5.6 kn until 0930.

   Give the 0930 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 1210 you fix your position 008°T, 1.6 nm from Kittle water tank. You steer 279°T at 8.7 kn until 1255, then 329°T at 5.1 kn until 1315.

   Give the 1315 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  

8. At 1005 you fix your position 214°T, 3.3 nm from Tern Island tower. You steer 078°T at 8.7 kn until 1025, then 276°T at 9.8 kn until 1050.

   Give the 1050 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