Worksheet 147 · Skill 3

Dead reckoning

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1. At 0920 you fix your position 112°T, 2.2 nm from Westfield church spire. You steer 139°T at 4.7 kn until 1005, then 314°T at 8.3 kn until 1020.

   Give the 1020 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  

2. At 0815 you fix your position 067°T, 4.7 nm from Tern Island tower. You steer 164°T at 6.9 kn until 0825, then 211°T at 5.4 kn until 0900.

   Give the 0900 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 0835 you fix your position 190°T, 1.9 nm from Tern Island tower. You steer 082°T at 6.7 kn until 0910, then 251°T at 5.5 kn until 0920.

   Give the 0920 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 1010 you fix your position 334°T, 1.5 nm from Kittle water tank. You steer 273°T at 8.5 kn until 1025, then 131°T at 4.6 kn until 1040.

   Give the 1040 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  

5. At 1400 you fix your position 303°T, 4.0 nm from Tern Island tower. You steer 113°T at 4.8 kn until 1415, then 231°T at 7.5 kn until 1500.

   Give the 1500 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 1220 you fix your position 039°T, 2.7 nm from Westfield church spire. You steer 131°T at 6.4 kn until 1240, then 167°T at 4.1 kn until 1310.

   Give the 1310 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  

7. At 1405 you fix your position 314°T, 3.1 nm from Tern Island tower. You steer 256°T at 5.4 kn until 1425, then 178°T at 9.8 kn until 1505.

   Give the 1505 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 0910 you fix your position 210°T, 2.0 nm from Gannet Rock daybeacon. You steer 017°T at 9.3 kn until 0950, then 176°T at 10.0 kn until 1005.

   Give the 1005 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