Worksheet 39 · Skill 3

Dead reckoning

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1. At 0900 you fix your position 343°T, 2.4 nm from Mill stack. You steer 139°T at 7.5 kn until 0910, then 033°T at 9.0 kn until 0930.

   Give the 0930 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  

2. At 1300 you fix your position 036°T, 2.7 nm from Heron Point Light. You steer 328°T at 5.0 kn until 1340, then 208°T at 8.0 kn until 1350.

   Give the 1350 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  

3. At 1455 you fix your position 055°T, 1.9 nm from Heron Point Light. You steer 235°T at 6.5 kn until 1505, then 050°T at 7.1 kn until 1520.

   Give the 1520 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  

4. At 0935 you fix your position 269°T, 2.1 nm from Tern Island tower. You steer 232°T at 8.9 kn until 0955, then 342°T at 7.5 kn until 1005.

   Give the 1005 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 1550 you fix your position 278°T, 2.3 nm from Tern Island tower. You steer 238°T at 4.9 kn until 1615, then 018°T at 6.2 kn until 1645.

   Give the 1645 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 1330 you fix your position 342°T, 2.6 nm from Tern Island tower. You steer 259°T at 5.2 kn until 1415, then 215°T at 9.1 kn until 1430.

   Give the 1430 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  

7. At 1355 you fix your position 101°T, 2.0 nm from Tern Island tower. You steer 058°T at 5.9 kn until 1425, then 261°T at 4.9 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  

8. At 1215 you fix your position 015°T, 2.0 nm from Heron Point Light. You steer 319°T at 7.5 kn until 1235, then 136°T at 9.7 kn until 1300.

   Give the 1300 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