Worksheet 420 · Skill 3

Dead reckoning

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1. At 0825 you fix your position 245°T, 3.3 nm from Tern Island tower. You steer 002°T at 4.2 kn until 0840, then 155°T at 7.9 kn until 0920.

   Give the 0920 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 0915 you fix your position 239°T, 3.0 nm from Tern Island tower. You steer 291°T at 7.9 kn until 0950, then 116°T at 5.7 kn until 1015.

   Give the 1015 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  

3. At 1315 you fix your position 203°T, 1.7 nm from Gannet Rock daybeacon. You steer 307°T at 9.1 kn until 1400, then 226°T at 6.8 kn until 1410.

   Give the 1410 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  

4. At 1435 you fix your position 114°T, 1.6 nm from Gannet Rock daybeacon. You steer 354°T at 5.8 kn until 1505, then 159°T at 4.3 kn until 1550.

   Give the 1550 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  

5. At 0805 you fix your position 040°T, 4.1 nm from Westfield church spire. You steer 179°T at 8.1 kn until 0825, then 337°T at 4.8 kn until 0850.

   Give the 0850 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 0900 you fix your position 283°T, 0.9 nm from Gannet Rock daybeacon. You steer 248°T at 5.9 kn until 0910, then 030°T at 5.6 kn until 0925.

   Give the 0925 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  

7. At 1310 you fix your position 261°T, 3.1 nm from Tern Island tower. You steer 164°T at 4.5 kn until 1335, then 109°T at 8.2 kn until 1345.

   Give the 1345 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 1340 you fix your position 237°T, 3.3 nm from Tern Island tower. You steer 129°T at 8.5 kn until 1410, then 055°T at 7.5 kn until 1445.

   Give the 1445 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