Worksheet 267 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 057°T, 2.8 nm from Heron Point Light. You steer 348°T at 6.7 kn until 1120, then 225°T at 8.5 kn until 1140.

   Give the 1140 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  

2. At 1110 you fix your position 055°T, 2.5 nm from Westfield church spire. You steer 131°T at 8.8 kn until 1130, then 197°T at 6.4 kn until 1155.

   Give the 1155 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 1340 you fix your position 089°T, 2.1 nm from Westfield church spire. You steer 333°T at 6.0 kn until 1405, then 165°T at 6.4 kn until 1425.

   Give the 1425 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 0945 you fix your position 267°T, 3.3 nm from Tern Island tower. You steer 309°T at 5.7 kn until 1000, then 162°T at 6.5 kn until 1035.

   Give the 1035 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  

5. At 0825 you fix your position 341°T, 1.1 nm from Kittle water tank. You steer 355°T at 7.2 kn until 0905, then 307°T at 4.5 kn until 0925.

   Give the 0925 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 0830 you fix your position 048°T, 3.1 nm from Tern Island tower. You steer 145°T at 5.9 kn until 0900, then 245°T at 9.7 kn until 0915.

   Give the 0915 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 1335 you fix your position 109°T, 2.2 nm from Westfield church spire. You steer 023°T at 4.0 kn until 1350, then 341°T at 8.6 kn until 1415.

   Give the 1415 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  

8. At 1040 you fix your position 282°T, 3.4 nm from Tern Island tower. You steer 153°T at 6.3 kn until 1055, then 238°T at 6.5 kn until 1120.

   Give the 1120 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