Worksheet 723 · Skill 3

Dead reckoning

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1. At 1525 you fix your position 050°T, 3.0 nm from Westfield church spire. You steer 137°T at 5.4 kn until 1555, then 268°T at 6.6 kn until 1615.

   Give the 1615 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 0900 you fix your position 231°T, 2.1 nm from Tern Island tower. You steer 299°T at 5.1 kn until 0935, then 134°T at 6.1 kn until 1010.

   Give the 1010 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 1500 you fix your position 243°T, 1.9 nm from Gannet Rock daybeacon. You steer 089°T at 4.1 kn until 1540, then 259°T at 8.4 kn until 1550.

   Give the 1550 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  

4. At 1220 you fix your position 343°T, 2.9 nm from Kittle water tank. You steer 101°T at 5.0 kn until 1230, then 002°T at 4.6 kn until 1250.

   Give the 1250 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 1055 you fix your position 206°T, 3.0 nm from Tern Island tower. You steer 225°T at 6.2 kn until 1110, then 063°T at 10.0 kn until 1140.

   Give the 1140 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  

6. At 1015 you fix your position 134°T, 2.9 nm from Tern Island tower. You steer 349°T at 4.2 kn until 1030, then 217°T at 6.6 kn until 1045.

   Give the 1045 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 1200 you fix your position 359°T, 3.1 nm from Mill stack. You steer 334°T at 7.8 kn until 1225, then 026°T at 7.9 kn until 1235.

   Give the 1235 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 1005 you fix your position 018°T, 2.2 nm from Kittle water tank. You steer 337°T at 5.7 kn until 1045, then 112°T at 6.3 kn until 1110.

   Give the 1110 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