Worksheet 343 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 049°T, 3.4 nm from Westfield church spire. You steer 182°T at 9.2 kn until 1420, then 115°T at 8.7 kn until 1455.

   Give the 1455 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  

2. At 1050 you fix your position 037°T, 2.1 nm from Mill stack. You steer 320°T at 7.3 kn until 1115, then 002°T at 5.6 kn until 1155.

   Give the 1155 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 0750 you fix your position 276°T, 0.9 nm from Gannet Rock daybeacon. You steer 227°T at 4.0 kn until 0830, then 075°T at 4.5 kn until 0905.

   Give the 0905 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 1015 you fix your position 223°T, 3.4 nm from Tern Island tower. You steer 337°T at 4.4 kn until 1045, then 030°T at 6.1 kn until 1105.

   Give the 1105 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 0835 you fix your position 221°T, 1.7 nm from Tern Island tower. You steer 133°T at 5.2 kn until 0855, then 056°T at 9.2 kn until 0910.

   Give the 0910 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 0725 you fix your position 332°T, 2.0 nm from Tern Island tower. You steer 095°T at 4.4 kn until 0755, then 166°T at 10.0 kn until 0820.

   Give the 0820 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  

7. At 1235 you fix your position 270°T, 2.1 nm from Gannet Rock daybeacon. You steer 309°T at 5.1 kn until 1305, then 212°T at 9.3 kn until 1315.

   Give the 1315 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 1600 you fix your position 042°T, 2.2 nm from Heron Point Light. You steer 211°T at 6.0 kn until 1615, then 331°T at 5.8 kn until 1645.

   Give the 1645 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