Worksheet 678 · Skill 3

Dead reckoning

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1. At 1150 you fix your position 293°T, 3.0 nm from Tern Island tower. You steer 119°T at 5.8 kn until 1200, then 204°T at 8.6 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  

2. At 1135 you fix your position 313°T, 1.8 nm from Tern Island tower. You steer 188°T at 6.2 kn until 1155, then 249°T at 8.7 kn until 1230.

   Give the 1230 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 1320 you fix your position 136°T, 1.3 nm from Westfield church spire. You steer 130°T at 6.7 kn until 1355, then 037°T at 5.4 kn until 1415.

   Give the 1415 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  

4. At 1130 you fix your position 008°T, 1.7 nm from Gannet Rock daybeacon. You steer 238°T at 8.3 kn until 1150, then 079°T at 6.7 kn until 1215.

   Give the 1215 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 1020 you fix your position 250°T, 2.5 nm from Gannet Rock daybeacon. You steer 118°T at 7.6 kn until 1040, then 016°T at 7.7 kn until 1050.

   Give the 1050 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 1355 you fix your position 195°T, 1.7 nm from Gannet Rock daybeacon. You steer 057°T at 9.3 kn until 1415, then 019°T at 4.9 kn until 1430.

   Give the 1430 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 1050 you fix your position 226°T, 2.9 nm from Tern Island tower. You steer 262°T at 6.0 kn until 1110, then 037°T at 9.8 kn until 1120.

   Give the 1120 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 0925 you fix your position 055°T, 3.8 nm from Westfield church spire. You steer 124°T at 5.9 kn until 0955, then 317°T at 6.6 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