Worksheet 437 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 263°T, 2.8 nm from Tern Island tower. You steer 285°T at 4.0 kn until 1410, then 130°T at 8.6 kn until 1435.

   Give the 1435 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 1200 you fix your position 052°T, 2.2 nm from Heron Point Light. You steer 177°T at 4.1 kn until 1210, then 321°T at 9.4 kn until 1240.

   Give the 1240 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  

3. At 0825 you fix your position 144°T, 1.2 nm from Westfield church spire. You steer 087°T at 6.4 kn until 0840, then 031°T at 7.2 kn until 0910.

   Give the 0910 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 054°T, 1.9 nm from Kittle water tank. You steer 284°T at 8.1 kn until 1410, then 047°T at 9.2 kn until 1440.

   Give the 1440 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 1415 you fix your position 282°T, 3.1 nm from Tern Island tower. You steer 184°T at 4.5 kn until 1455, then 086°T at 8.0 kn until 1505.

   Give the 1505 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 0810 you fix your position 295°T, 3.4 nm from Tern Island tower. You steer 157°T at 4.4 kn until 0845, then 016°T at 8.6 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  

7. At 1325 you fix your position 073°T, 2.4 nm from Gannet Rock daybeacon. You steer 116°T at 4.0 kn until 1335, then 272°T at 9.5 kn until 1345.

   Give the 1345 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 1400 you fix your position 093°T, 1.8 nm from Westfield church spire. You steer 171°T at 6.1 kn until 1425, then 056°T at 5.5 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