Worksheet 114 · Skill 3

Dead reckoning

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1. At 0955 you fix your position 275°T, 3.1 nm from Tern Island tower. You steer 150°T at 4.5 kn until 1010, then 293°T at 5.4 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  

2. At 0700 you fix your position 072°T, 2.3 nm from Heron Point Light. You steer 004°T at 7.3 kn until 0740, then 317°T at 6.2 kn until 0750.

   Give the 0750 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 1425 you fix your position 041°T, 1.8 nm from Tern Island tower. You steer 155°T at 5.8 kn until 1505, then 335°T at 7.3 kn until 1545.

   Give the 1545 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 0855 you fix your position 105°T, 2.5 nm from Westfield church spire. You steer 114°T at 4.2 kn until 0920, then 347°T at 9.3 kn until 0940.

   Give the 0940 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 1350 you fix your position 323°T, 2.9 nm from Tern Island tower. You steer 139°T at 5.0 kn until 1410, then 265°T at 4.3 kn until 1420.

   Give the 1420 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 1405 you fix your position 127°T, 1.2 nm from Westfield church spire. You steer 138°T at 5.6 kn until 1420, then 036°T at 6.8 kn until 1500.

   Give the 1500 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 1300 you fix your position 262°T, 2.7 nm from Tern Island tower. You steer 183°T at 9.4 kn until 1315, then 290°T at 4.9 kn until 1345.

   Give the 1345 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 1335 you fix your position 072°T, 2.6 nm from Heron Point Light. You steer 130°T at 5.3 kn until 1350, then 093°T at 5.4 kn until 1405.

   Give the 1405 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