Worksheet 432 · Skill 3

Dead reckoning

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1. At 0740 you fix your position 035°T, 4.4 nm from Gannet Rock daybeacon. You steer 281°T at 7.8 kn until 0820, then 080°T at 7.9 kn until 0830.

   Give the 0830 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 1250 you fix your position 249°T, 2.0 nm from Gannet Rock daybeacon. You steer 001°T at 4.4 kn until 1315, then 223°T at 6.4 kn until 1330.

   Give the 1330 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 1025 you fix your position 059°T, 2.3 nm from Heron Point Light. You steer 093°T at 6.9 kn until 1045, then 243°T at 4.0 kn until 1130.

   Give the 1130 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 1140 you fix your position 069°T, 4.8 nm from Tern Island tower. You steer 267°T at 6.8 kn until 1205, then 083°T at 4.1 kn until 1245.

   Give the 1245 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 0920 you fix your position 058°T, 3.5 nm from Westfield church spire. You steer 163°T at 6.8 kn until 0935, then 030°T at 6.9 kn until 0955.

   Give the 0955 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 1000 you fix your position 231°T, 2.0 nm from Gannet Rock daybeacon. You steer 332°T at 8.5 kn until 1015, then 247°T at 6.5 kn until 1100.

   Give the 1100 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 1545 you fix your position 109°T, 2.4 nm from Westfield church spire. You steer 065°T at 5.2 kn until 1605, then 189°T at 4.9 kn until 1645.

   Give the 1645 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 1155 you fix your position 290°T, 2.6 nm from Tern Island tower. You steer 321°T at 6.0 kn until 1205, then 227°T at 7.4 kn until 1240.

   Give the 1240 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