Worksheet 701 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 209°T, 2.4 nm from Tern Island tower. You steer 348°T at 9.2 kn until 1040, then 290°T at 7.1 kn until 1055.

   Give the 1055 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 0735 you fix your position 041°T, 4.1 nm from Westfield church spire. You steer 127°T at 5.7 kn until 0800, then 212°T at 5.3 kn until 0830.

   Give the 0830 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 1245 you fix your position 267°T, 2.7 nm from Gannet Rock daybeacon. You steer 062°T at 8.1 kn until 1325, then 222°T at 6.7 kn until 1340.

   Give the 1340 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 0900 you fix your position 080°T, 2.3 nm from Tern Island tower. You steer 209°T at 8.4 kn until 0940, then 104°T at 5.8 kn until 0950.

   Give the 0950 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  

5. At 1210 you fix your position 339°T, 1.0 nm from Gannet Rock daybeacon. You steer 260°T at 8.9 kn until 1230, then 024°T at 4.1 kn until 1245.

   Give the 1245 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 0830 you fix your position 003°T, 1.6 nm from Kittle water tank. You steer 352°T at 10.0 kn until 0905, then 177°T at 6.4 kn until 0940.

   Give the 0940 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 1335 you fix your position 029°T, 1.7 nm from Gannet Rock daybeacon. You steer 063°T at 5.3 kn until 1355, then 306°T at 6.8 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  

8. At 0725 you fix your position 097°T, 1.9 nm from Tern Island tower. You steer 073°T at 5.3 kn until 0740, then 250°T at 5.5 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