Worksheet 165 · Skill 3

Dead reckoning

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1. At 1505 you fix your position 032°T, 2.5 nm from Tern Island tower. You steer 169°T at 4.2 kn until 1515, then 113°T at 5.1 kn until 1530.

   Give the 1530 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 1120 you fix your position 265°T, 3.6 nm from Tern Island tower. You steer 147°T at 9.9 kn until 1130, then 034°T at 6.3 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  

3. At 1310 you fix your position 008°T, 2.3 nm from Heron Point Light. You steer 004°T at 7.2 kn until 1330, then 149°T at 5.6 kn until 1405.

   Give the 1405 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 1550 you fix your position 301°T, 2.0 nm from Tern Island tower. You steer 230°T at 6.9 kn until 1610, then 328°T at 4.5 kn until 1630.

   Give the 1630 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 0855 you fix your position 281°T, 3.9 nm from Tern Island tower. You steer 342°T at 4.6 kn until 0910, then 213°T at 7.7 kn until 0930.

   Give the 0930 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  

6. At 1440 you fix your position 007°T, 1.7 nm from Mill stack. You steer 286°T at 5.8 kn until 1525, then 087°T at 4.2 kn until 1600.

   Give the 1600 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 0925 you fix your position 290°T, 3.2 nm from Tern Island tower. You steer 165°T at 5.7 kn until 1005, then 219°T at 5.5 kn until 1015.

   Give the 1015 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  

8. At 0940 you fix your position 047°T, 3.3 nm from Heron Point Light. You steer 101°T at 9.5 kn until 1010, then 317°T at 9.5 kn until 1020.

   Give the 1020 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