Worksheet 87 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 114°T, 1.6 nm from Westfield church spire. You steer 088°T at 8.0 kn until 1120, then 013°T at 4.8 kn until 1140.

   Give the 1140 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  

2. At 0720 you fix your position 222°T, 1.6 nm from Tern Island tower. You steer 236°T at 6.8 kn until 0745, then 356°T at 5.6 kn until 0825.

   Give the 0825 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 1140 you fix your position 313°T, 1.5 nm from Kittle water tank. You steer 049°T at 7.3 kn until 1200, then 225°T at 9.9 kn until 1210.

   Give the 1210 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  

4. At 1320 you fix your position 018°T, 2.7 nm from Heron Point Light. You steer 205°T at 5.7 kn until 1340, then 330°T at 5.6 kn until 1405.

   Give the 1405 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 1120 you fix your position 222°T, 2.9 nm from Tern Island tower. You steer 352°T at 7.0 kn until 1200, then 163°T at 7.2 kn until 1210.

   Give the 1210 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 1520 you fix your position 054°T, 4.0 nm from Westfield church spire. You steer 214°T at 9.0 kn until 1535, then 036°T at 8.8 kn until 1555.

   Give the 1555 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  

7. At 0955 you fix your position 070°T, 3.5 nm from Westfield church spire. You steer 199°T at 4.1 kn until 1020, then 050°T at 6.1 kn until 1030.

   Give the 1030 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  

8. At 1055 you fix your position 095°T, 2.0 nm from Gannet Rock daybeacon. You steer 322°T at 4.4 kn until 1120, then 151°T at 5.1 kn until 1205.

   Give the 1205 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