Worksheet 405 · Skill 3

Dead reckoning

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1. At 1210 you fix your position 258°T, 2.7 nm from Tern Island tower. You steer 108°T at 6.0 kn until 1245, then 215°T at 5.2 kn until 1300.

   Give the 1300 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  

2. At 1155 you fix your position 281°T, 3.4 nm from Tern Island tower. You steer 285°T at 8.8 kn until 1220, then 144°T at 6.5 kn until 1235.

   Give the 1235 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 1435 you fix your position 269°T, 2.0 nm from Tern Island tower. You steer 309°T at 4.5 kn until 1510, then 224°T at 9.2 kn until 1530.

   Give the 1530 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  

4. At 1025 you fix your position 047°T, 2.7 nm from Heron Point Light. You steer 354°T at 4.0 kn until 1050, then 164°T at 4.3 kn until 1105.

   Give the 1105 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 1135 you fix your position 262°T, 2.8 nm from Tern Island tower. You steer 112°T at 8.0 kn until 1150, then 246°T at 8.8 kn until 1220.

   Give the 1220 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  

6. At 1505 you fix your position 301°T, 2.0 nm from Kittle water tank. You steer 282°T at 5.9 kn until 1545, then 183°T at 4.7 kn until 1555.

   Give the 1555 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

7. At 1155 you fix your position 295°T, 2.1 nm from Tern Island tower. You steer 290°T at 4.5 kn until 1215, then 208°T at 9.3 kn until 1250.

   Give the 1250 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 1455 you fix your position 063°T, 4.9 nm from Tern Island tower. You steer 154°T at 4.6 kn until 1510, then 266°T at 7.4 kn until 1520.

   Give the 1520 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