Worksheet 670 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 002°T, 3.0 nm from Mill stack. You steer 267°T at 8.3 kn until 1020, then 154°T at 4.7 kn until 1040.

   Give the 1040 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 0730 you fix your position 215°T, 3.2 nm from Tern Island tower. You steer 311°T at 9.9 kn until 0750, then 037°T at 6.5 kn until 0820.

   Give the 0820 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 0945 you fix your position 055°T, 1.8 nm from Gannet Rock daybeacon. You steer 016°T at 4.7 kn until 0955, then 151°T at 5.2 kn until 1015.

   Give the 1015 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 1035 you fix your position 129°T, 1.4 nm from Gannet Rock daybeacon. You steer 070°T at 5.2 kn until 1045, then 236°T at 5.6 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 1425 you fix your position 110°T, 2.5 nm from Westfield church spire. You steer 023°T at 8.7 kn until 1450, then 163°T at 6.0 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  

6. At 0720 you fix your position 211°T, 2.3 nm from Tern Island tower. You steer 129°T at 7.3 kn until 0755, then 269°T at 4.2 kn until 0825.

   Give the 0825 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 0925 you fix your position 342°T, 2.8 nm from Kittle water tank. You steer 078°T at 6.5 kn until 0950, then 285°T at 4.2 kn until 1000.

   Give the 1000 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 1155 you fix your position 076°T, 2.1 nm from Westfield church spire. You steer 190°T at 7.7 kn until 1210, then 278°T at 8.3 kn until 1220.

   Give the 1220 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