Worksheet 64 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 336°T, 1.6 nm from Mill stack. You steer 027°T at 7.8 kn until 1405, then 346°T at 9.1 kn until 1445.

   Give the 1445 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 0830 you fix your position 044°T, 3.0 nm from Gannet Rock daybeacon. You steer 303°T at 8.3 kn until 0845, then 056°T at 4.2 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  

3. At 0940 you fix your position 274°T, 2.5 nm from Tern Island tower. You steer 174°T at 9.2 kn until 1005, then 092°T at 4.9 kn until 1025.

   Give the 1025 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  

4. At 1330 you fix your position 257°T, 3.6 nm from Tern Island tower. You steer 117°T at 6.6 kn until 1415, then 308°T at 4.4 kn until 1455.

   Give the 1455 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  

5. At 0745 you fix your position 318°T, 1.2 nm from Kittle water tank. You steer 311°T at 8.4 kn until 0805, then 047°T at 7.3 kn until 0830.

   Give the 0830 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  

6. At 1535 you fix your position 039°T, 4.6 nm from Gannet Rock daybeacon. You steer 311°T at 8.8 kn until 1550, then 160°T at 6.7 kn until 1605.

   Give the 1605 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 1230 you fix your position 342°T, 2.3 nm from Mill stack. You steer 072°T at 4.8 kn until 1255, then 103°T at 4.8 kn until 1305.

   Give the 1305 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 1425 you fix your position 193°T, 2.1 nm from Tern Island tower. You steer 265°T at 5.1 kn until 1440, then 091°T at 4.5 kn until 1450.

   Give the 1450 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