Worksheet 522 · Skill 3

Dead reckoning

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1. At 1420 you fix your position 056°T, 4.0 nm from Tern Island tower. You steer 259°T at 8.1 kn until 1430, then 121°T at 4.7 kn until 1500.

   Give the 1500 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 1330 you fix your position 275°T, 2.5 nm from Tern Island tower. You steer 239°T at 4.8 kn until 1340, then 184°T at 7.6 kn until 1405.

   Give the 1405 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  

3. At 1205 you fix your position 353°T, 2.8 nm from Mill stack. You steer 086°T at 6.2 kn until 1250, then 048°T at 6.7 kn until 1300.

   Give the 1300 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 0945 you fix your position 052°T, 2.1 nm from Tern Island tower. You steer 280°T at 7.3 kn until 1030, then 079°T at 6.3 kn until 1045.

   Give the 1045 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  

5. At 0745 you fix your position 296°T, 4.0 nm from Tern Island tower. You steer 129°T at 4.0 kn until 0805, then 226°T at 9.7 kn until 0825.

   Give the 0825 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  

6. At 1440 you fix your position 324°T, 1.9 nm from Mill stack. You steer 302°T at 9.3 kn until 1450, then 086°T at 5.0 kn until 1515.

   Give the 1515 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 1335 you fix your position 344°T, 2.7 nm from Kittle water tank. You steer 019°T at 4.6 kn until 1420, then 291°T at 5.3 kn until 1455.

   Give the 1455 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 1425 you fix your position 296°T, 2.5 nm from Tern Island tower. You steer 199°T at 8.4 kn until 1440, then 280°T at 8.7 kn until 1455.

   Give the 1455 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