Worksheet 383 · Skill 3

Dead reckoning

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1. At 0840 you fix your position 057°T, 2.2 nm from Heron Point Light. You steer 357°T at 8.2 kn until 0915, then 254°T at 4.1 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  

2. At 0850 you fix your position 001°T, 1.6 nm from Heron Point Light. You steer 353°T at 7.0 kn until 0920, then 086°T at 8.3 kn until 0940.

   Give the 0940 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 1340 you fix your position 282°T, 2.6 nm from Tern Island tower. You steer 071°T at 6.0 kn until 1425, then 102°T at 4.1 kn until 1445.

   Give the 1445 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 1330 you fix your position 048°T, 2.4 nm from Gannet Rock daybeacon. You steer 223°T at 6.0 kn until 1350, then 026°T at 8.9 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  

5. At 0745 you fix your position 312°T, 1.8 nm from Kittle water tank. You steer 042°T at 5.5 kn until 0830, then 347°T at 7.2 kn until 0855.

   Give the 0855 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 1205 you fix your position 040°T, 2.9 nm from Westfield church spire. You steer 015°T at 7.9 kn until 1215, then 148°T at 7.9 kn until 1225.

   Give the 1225 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 1500 you fix your position 024°T, 2.1 nm from Mill stack. You steer 022°T at 8.6 kn until 1520, then 143°T at 7.8 kn until 1540.

   Give the 1540 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  

8. At 0920 you fix your position 069°T, 4.9 nm from Tern Island tower. You steer 222°T at 7.4 kn until 0955, then 096°T at 8.0 kn until 1010.

   Give the 1010 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