Worksheet 109 · Skill 3

Dead reckoning

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1. At 1035 you fix your position 049°T, 2.2 nm from Gannet Rock daybeacon. You steer 330°T at 7.8 kn until 1050, then 287°T at 9.5 kn until 1125.

   Give the 1125 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 1205 you fix your position 217°T, 1.8 nm from Gannet Rock daybeacon. You steer 348°T at 5.2 kn until 1225, then 280°T at 8.1 kn until 1305.

   Give the 1305 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 1125 you fix your position 357°T, 2.0 nm from Tern Island tower. You steer 283°T at 5.2 kn until 1145, then 197°T at 4.7 kn until 1230.

   Give the 1230 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 0900 you fix your position 095°T, 2.3 nm from Westfield church spire. You steer 131°T at 7.6 kn until 0910, then 256°T at 4.5 kn until 0930.

   Give the 0930 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 1445 you fix your position 024°T, 2.7 nm from Gannet Rock daybeacon. You steer 039°T at 9.6 kn until 1455, then 262°T at 4.0 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  

6. At 0945 you fix your position 011°T, 1.5 nm from Tern Island tower. You steer 009°T at 6.0 kn until 0955, then 246°T at 4.8 kn until 1020.

   Give the 1020 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 0900 you fix your position 003°T, 1.8 nm from Mill stack. You steer 347°T at 9.6 kn until 0920, then 117°T at 8.0 kn until 0930.

   Give the 0930 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 0735 you fix your position 236°T, 2.5 nm from Gannet Rock daybeacon. You steer 320°T at 5.7 kn until 0815, then 134°T at 4.3 kn until 0825.

   Give the 0825 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