Worksheet 220 · Skill 3

Dead reckoning

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1. At 0745 you fix your position 245°T, 1.9 nm from Gannet Rock daybeacon. You steer 322°T at 9.1 kn until 0755, then 107°T at 7.2 kn until 0815.

   Give the 0815 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 1355 you fix your position 062°T, 4.4 nm from Tern Island tower. You steer 264°T at 5.1 kn until 1430, then 088°T at 6.2 kn until 1450.

   Give the 1450 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 1405 you fix your position 313°T, 1.6 nm from Kittle water tank. You steer 053°T at 9.7 kn until 1415, then 123°T at 4.6 kn until 1435.

   Give the 1435 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

4. At 0855 you fix your position 064°T, 2.2 nm from Westfield church spire. You steer 143°T at 4.3 kn until 0925, then 341°T at 7.5 kn until 0955.

   Give the 0955 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  

5. At 1025 you fix your position 076°T, 2.3 nm from Tern Island tower. You steer 105°T at 5.3 kn until 1055, then 330°T at 4.3 kn until 1115.

   Give the 1115 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 1235 you fix your position 200°T, 2.4 nm from Tern Island tower. You steer 170°T at 4.9 kn until 1305, then 082°T at 5.4 kn until 1315.

   Give the 1315 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 1355 you fix your position 047°T, 3.5 nm from Westfield church spire. You steer 143°T at 5.5 kn until 1440, then 271°T at 7.0 kn until 1500.

   Give the 1500 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 0815 you fix your position 353°T, 3.4 nm from Mill stack. You steer 032°T at 9.6 kn until 0825, then 201°T at 6.5 kn until 0855.

   Give the 0855 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