Worksheet 338 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 163°T, 1.4 nm from Tern Island tower. You steer 278°T at 8.5 kn until 1045, then 203°T at 7.3 kn until 1120.

   Give the 1120 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 1055 you fix your position 064°T, 1.5 nm from Heron Point Light. You steer 079°T at 8.7 kn until 1110, then 009°T at 7.6 kn until 1145.

   Give the 1145 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 1015 you fix your position 078°T, 1.2 nm from Westfield church spire. You steer 113°T at 7.1 kn until 1055, then 181°T at 5.8 kn until 1110.

   Give the 1110 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  

4. At 1320 you fix your position 036°T, 3.2 nm from Gannet Rock daybeacon. You steer 215°T at 9.8 kn until 1335, then 139°T at 7.5 kn until 1400.

   Give the 1400 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  

5. At 1510 you fix your position 231°T, 2.8 nm from Tern Island tower. You steer 104°T at 4.2 kn until 1550, then 304°T at 7.6 kn until 1625.

   Give the 1625 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 1025 you fix your position 117°T, 2.2 nm from Westfield church spire. You steer 274°T at 6.0 kn until 1035, then 230°T at 4.1 kn until 1045.

   Give the 1045 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 0735 you fix your position 036°T, 1.8 nm from Tern Island tower. You steer 154°T at 8.6 kn until 0755, then 185°T at 4.4 kn until 0810.

   Give the 0810 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 0705 you fix your position 025°T, 3.4 nm from Westfield church spire. You steer 163°T at 6.5 kn until 0735, then 043°T at 5.9 kn until 0815.

   Give the 0815 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