Worksheet 309 · Skill 3

Dead reckoning

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1. At 1245 you fix your position 131°T, 1.4 nm from Gannet Rock daybeacon. You steer 198°T at 4.7 kn until 1255, then 015°T at 7.8 kn until 1340.

   Give the 1340 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 1120 you fix your position 301°T, 3.5 nm from Tern Island tower. You steer 255°T at 4.8 kn until 1155, then 116°T at 6.0 kn until 1220.

   Give the 1220 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  

3. At 0805 you fix your position 250°T, 3.5 nm from Tern Island tower. You steer 157°T at 5.8 kn until 0815, then 018°T at 7.3 kn until 0850.

   Give the 0850 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 1335 you fix your position 334°T, 1.4 nm from Kittle water tank. You steer 317°T at 5.8 kn until 1405, then 067°T at 4.4 kn until 1415.

   Give the 1415 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 0730 you fix your position 221°T, 2.7 nm from Tern Island tower. You steer 166°T at 5.0 kn until 0755, then 283°T at 8.4 kn until 0825.

   Give the 0825 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 0930 you fix your position 048°T, 2.1 nm from Westfield church spire. You steer 034°T at 6.5 kn until 0955, then 130°T at 4.5 kn until 1025.

   Give the 1025 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 1520 you fix your position 054°T, 1.7 nm from Kittle water tank. You steer 328°T at 9.0 kn until 1540, then 002°T at 7.0 kn until 1615.

   Give the 1615 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 1310 you fix your position 296°T, 3.2 nm from Tern Island tower. You steer 172°T at 4.6 kn until 1340, then 026°T at 8.1 kn until 1355.

   Give the 1355 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