Worksheet 495 · Skill 3

Dead reckoning

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1. At 1530 you fix your position 269°T, 2.7 nm from Tern Island tower. You steer 265°T at 9.8 kn until 1545, then 088°T at 10.0 kn until 1600.

   Give the 1600 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 1435 you fix your position 243°T, 3.0 nm from Tern Island tower. You steer 003°T at 4.3 kn until 1500, then 132°T at 8.5 kn until 1535.

   Give the 1535 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 1135 you fix your position 271°T, 1.7 nm from Tern Island tower. You steer 042°T at 4.1 kn until 1155, then 252°T at 9.5 kn until 1205.

   Give the 1205 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  

4. At 1355 you fix your position 019°T, 2.6 nm from Heron Point Light. You steer 083°T at 5.2 kn until 1430, then 161°T at 4.1 kn until 1510.

   Give the 1510 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  

5. At 1345 you fix your position 072°T, 1.4 nm from Heron Point Light. You steer 106°T at 9.8 kn until 1355, then 351°T at 7.1 kn until 1425.

   Give the 1425 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 1010 you fix your position 259°T, 1.8 nm from Gannet Rock daybeacon. You steer 311°T at 5.0 kn until 1055, then 135°T at 9.6 kn until 1115.

   Give the 1115 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 1315 you fix your position 267°T, 1.3 nm from Tern Island tower. You steer 216°T at 4.2 kn until 1335, then 353°T at 4.1 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 0700 you fix your position 135°T, 3.1 nm from Tern Island tower. You steer 145°T at 7.6 kn until 0710, then 255°T at 6.1 kn until 0745.

   Give the 0745 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