Worksheet 61 · Skill 3

Dead reckoning

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1. At 0850 you fix your position 036°T, 2.8 nm from Westfield church spire. You steer 293°T at 5.1 kn until 0905, then 065°T at 4.1 kn until 0935.

   Give the 0935 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 1240 you fix your position 062°T, 2.3 nm from Westfield church spire. You steer 143°T at 5.7 kn until 1300, then 223°T at 7.1 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  

3. At 1040 you fix your position 187°T, 1.7 nm from Tern Island tower. You steer 059°T at 5.0 kn until 1120, then 194°T at 4.4 kn until 1150.

   Give the 1150 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  

4. At 1235 you fix your position 067°T, 2.6 nm from Westfield church spire. You steer 170°T at 7.2 kn until 1300, then 259°T at 6.7 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  

5. At 0705 you fix your position 286°T, 0.8 nm from Gannet Rock daybeacon. You steer 177°T at 7.9 kn until 0715, then 105°T at 4.1 kn until 0750.

   Give the 0750 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  

6. At 0725 you fix your position 000°T, 1.3 nm from Heron Point Light. You steer 025°T at 6.1 kn until 0735, then 087°T at 4.1 kn until 0755.

   Give the 0755 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 0915 you fix your position 249°T, 2.9 nm from Tern Island tower. You steer 248°T at 4.9 kn until 0940, then 053°T at 8.3 kn until 1020.

   Give the 1020 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 1045 you fix your position 035°T, 3.7 nm from Westfield church spire. You steer 174°T at 5.5 kn until 1120, then 109°T at 4.1 kn until 1150.

   Give the 1150 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