Worksheet 438 · Skill 3

Dead reckoning

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1. At 1255 you fix your position 022°T, 2.6 nm from Gannet Rock daybeacon. You steer 152°T at 8.5 kn until 1325, then 008°T at 9.4 kn until 1340.

   Give the 1340 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 0920 you fix your position 086°T, 3.7 nm from Westfield church spire. You steer 113°T at 4.8 kn until 0950, then 081°T at 9.3 kn until 1030.

   Give the 1030 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  

3. At 1300 you fix your position 291°T, 3.0 nm from Tern Island tower. You steer 253°T at 5.7 kn until 1340, then 163°T at 6.7 kn until 1400.

   Give the 1400 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 0905 you fix your position 249°T, 2.2 nm from Gannet Rock daybeacon. You steer 129°T at 4.0 kn until 0930, then 002°T at 4.9 kn until 1015.

   Give the 1015 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 1135 you fix your position 054°T, 2.6 nm from Mill stack. You steer 349°T at 5.5 kn until 1205, then 314°T at 10.0 kn until 1215.

   Give the 1215 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 1305 you fix your position 117°T, 1.7 nm from Westfield church spire. You steer 330°T at 5.3 kn until 1335, then 099°T at 6.4 kn until 1410.

   Give the 1410 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 0750 you fix your position 061°T, 4.4 nm from Tern Island tower. You steer 146°T at 8.0 kn until 0800, then 239°T at 5.6 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  

8. At 0915 you fix your position 016°T, 2.8 nm from Mill stack. You steer 273°T at 8.1 kn until 0935, then 318°T at 6.3 kn until 0955.

   Give the 0955 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