Worksheet 618 · Skill 3

Dead reckoning

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1. At 1445 you fix your position 308°T, 2.4 nm from Tern Island tower. You steer 060°T at 7.8 kn until 1500, then 099°T at 4.2 kn until 1545.

   Give the 1545 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 0950 you fix your position 316°T, 1.4 nm from Kittle water tank. You steer 030°T at 8.3 kn until 1000, then 357°T at 9.1 kn until 1025.

   Give the 1025 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 1345 you fix your position 267°T, 2.5 nm from Tern Island tower. You steer 174°T at 8.8 kn until 1410, then 275°T at 4.5 kn until 1445.

   Give the 1445 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  

4. At 1105 you fix your position 111°T, 1.2 nm from Westfield church spire. You steer 091°T at 6.9 kn until 1115, then 057°T at 5.1 kn until 1150.

   Give the 1150 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 0710 you fix your position 028°T, 2.4 nm from Mill stack. You steer 229°T at 4.5 kn until 0725, then 316°T at 6.3 kn until 0805.

   Give the 0805 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  

6. At 1025 you fix your position 002°T, 2.8 nm from Mill stack. You steer 358°T at 4.8 kn until 1040, then 280°T at 7.1 kn until 1050.

   Give the 1050 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 1435 you fix your position 292°T, 2.3 nm from Tern Island tower. You steer 247°T at 8.0 kn until 1455, then 033°T at 7.1 kn until 1515.

   Give the 1515 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 1350 you fix your position 071°T, 3.7 nm from Westfield church spire. You steer 271°T at 4.5 kn until 1425, then 102°T at 9.1 kn until 1505.

   Give the 1505 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