Worksheet 280 · Skill 3

Dead reckoning

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1. At 1410 you fix your position 010°T, 1.8 nm from Westfield church spire. You steer 086°T at 4.9 kn until 1455, then 142°T at 6.4 kn until 1525.

   Give the 1525 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 0750 you fix your position 067°T, 1.7 nm from Gannet Rock daybeacon. You steer 339°T at 7.2 kn until 0815, then 160°T at 6.2 kn until 0850.

   Give the 0850 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  

3. At 0925 you fix your position 071°T, 2.7 nm from Westfield church spire. You steer 160°T at 8.7 kn until 0955, then 302°T at 9.2 kn until 1015.

   Give the 1015 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 1235 you fix your position 243°T, 1.5 nm from Tern Island tower. You steer 199°T at 9.2 kn until 1305, then 312°T at 7.8 kn until 1330.

   Give the 1330 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  

5. At 1555 you fix your position 066°T, 3.0 nm from Gannet Rock daybeacon. You steer 260°T at 7.0 kn until 1605, then 352°T at 9.3 kn until 1620.

   Give the 1620 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 0855 you fix your position 020°T, 2.5 nm from Heron Point Light. You steer 289°T at 4.7 kn until 0910, then 038°T at 4.1 kn until 0955.

   Give the 0955 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 1505 you fix your position 015°T, 3.0 nm from Westfield church spire. You steer 172°T at 8.0 kn until 1545, then 059°T at 7.7 kn until 1625.

   Give the 1625 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 0940 you fix your position 021°T, 1.9 nm from Kittle water tank. You steer 312°T at 6.9 kn until 1010, then 074°T at 8.9 kn until 1030.

   Give the 1030 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