Worksheet 515 · Skill 3

Dead reckoning

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1. At 1245 you fix your position 286°T, 2.0 nm from Tern Island tower. You steer 260°T at 5.1 kn until 1325, then 157°T at 8.4 kn until 1355.

   Give the 1355 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  

2. At 1355 you fix your position 057°T, 3.5 nm from Westfield church spire. You steer 109°T at 7.0 kn until 1415, then 225°T at 5.0 kn until 1445.

   Give the 1445 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 0705 you fix your position 022°T, 1.4 nm from Tern Island tower. You steer 138°T at 7.2 kn until 0740, then 350°T at 5.2 kn until 0750.

   Give the 0750 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  

4. At 1510 you fix your position 061°T, 2.1 nm from Tern Island tower. You steer 197°T at 5.3 kn until 1535, then 251°T at 4.7 kn until 1610.

   Give the 1610 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 0710 you fix your position 026°T, 1.5 nm from Gannet Rock daybeacon. You steer 027°T at 7.7 kn until 0720, then 242°T at 7.7 kn until 0800.

   Give the 0800 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 1200 you fix your position 044°T, 3.1 nm from Heron Point Light. You steer 164°T at 5.7 kn until 1215, then 093°T at 9.5 kn until 1230.

   Give the 1230 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  

7. At 1350 you fix your position 026°T, 2.8 nm from Westfield church spire. You steer 168°T at 6.7 kn until 1430, then 024°T at 5.2 kn until 1440.

   Give the 1440 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  

8. At 0810 you fix your position 039°T, 2.9 nm from Westfield church spire. You steer 091°T at 5.3 kn until 0830, then 133°T at 8.1 kn until 0845.

   Give the 0845 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