Worksheet 142 · Skill 3

Dead reckoning

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1. At 0800 you fix your position 353°T, 1.3 nm from Heron Point Light. You steer 053°T at 5.9 kn until 0845, then 267°T at 8.9 kn until 0855.

   Give the 0855 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 0910 you fix your position 068°T, 4.4 nm from Tern Island tower. You steer 208°T at 5.3 kn until 0935, then 033°T at 5.9 kn until 1005.

   Give the 1005 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 0820 you fix your position 304°T, 1.1 nm from Gannet Rock daybeacon. You steer 241°T at 7.1 kn until 0905, then 138°T at 4.7 kn until 0915.

   Give the 0915 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 1500 you fix your position 054°T, 2.3 nm from Heron Point Light. You steer 016°T at 8.7 kn until 1510, then 068°T at 6.6 kn until 1525.

   Give the 1525 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 0750 you fix your position 266°T, 2.3 nm from Tern Island tower. You steer 177°T at 5.4 kn until 0810, then 332°T at 5.6 kn until 0840.

   Give the 0840 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 1100 you fix your position 048°T, 3.3 nm from Westfield church spire. You steer 051°T at 5.4 kn until 1125, then 235°T at 8.0 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  

7. At 1210 you fix your position 033°T, 3.3 nm from Heron Point Light. You steer 275°T at 4.8 kn until 1245, then 143°T at 4.1 kn until 1320.

   Give the 1320 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  

8. At 1300 you fix your position 001°T, 3.3 nm from Mill stack. You steer 302°T at 6.0 kn until 1335, then 098°T at 5.2 kn until 1350.

   Give the 1350 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