Worksheet 403 · Skill 3

Dead reckoning

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1. At 0740 you fix your position 231°T, 3.0 nm from Tern Island tower. You steer 274°T at 6.5 kn until 0810, then 035°T at 7.7 kn until 0830.

   Give the 0830 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 1415 you fix your position 035°T, 2.8 nm from Gannet Rock daybeacon. You steer 275°T at 6.0 kn until 1430, then 156°T at 4.5 kn until 1500.

   Give the 1500 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  

3. At 1235 you fix your position 225°T, 2.7 nm from Tern Island tower. You steer 195°T at 8.1 kn until 1250, then 113°T at 8.5 kn until 1310.

   Give the 1310 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 1250 you fix your position 282°T, 1.5 nm from Gannet Rock daybeacon. You steer 055°T at 4.7 kn until 1335, then 181°T at 5.3 kn until 1350.

   Give the 1350 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  

5. At 1025 you fix your position 046°T, 2.8 nm from Westfield church spire. You steer 225°T at 9.3 kn until 1035, then 102°T at 5.6 kn until 1055.

   Give the 1055 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  

6. At 1105 you fix your position 016°T, 2.7 nm from Heron Point Light. You steer 114°T at 10.0 kn until 1135, then 238°T at 4.5 kn until 1210.

   Give the 1210 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  

7. At 0740 you fix your position 052°T, 3.4 nm from Heron Point Light. You steer 086°T at 6.7 kn until 0805, then 319°T at 4.0 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  

8. At 0955 you fix your position 259°T, 2.9 nm from Gannet Rock daybeacon. You steer 242°T at 4.7 kn until 1010, then 106°T at 7.3 kn until 1045.

   Give the 1045 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