Worksheet 454 · Skill 3

Dead reckoning

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1. At 0830 you fix your position 196°T, 2.1 nm from Tern Island tower. You steer 211°T at 4.1 kn until 0915, then 010°T at 4.7 kn until 1000.

   Give the 1000 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 0935 you fix your position 173°T, 1.3 nm from Gannet Rock daybeacon. You steer 266°T at 5.0 kn until 0945, then 296°T at 9.6 kn until 1025.

   Give the 1025 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 1310 you fix your position 028°T, 3.7 nm from Westfield church spire. You steer 147°T at 4.0 kn until 1345, then 057°T at 6.7 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  

4. At 1530 you fix your position 312°T, 1.3 nm from Gannet Rock daybeacon. You steer 230°T at 6.3 kn until 1545, then 061°T at 7.2 kn until 1610.

   Give the 1610 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 1250 you fix your position 028°T, 2.1 nm from Westfield church spire. You steer 117°T at 5.6 kn until 1300, then 185°T at 5.0 kn until 1340.

   Give the 1340 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 1050 you fix your position 073°T, 4.0 nm from Tern Island tower. You steer 192°T at 4.4 kn until 1130, then 266°T at 6.8 kn until 1200.

   Give the 1200 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 1550 you fix your position 256°T, 2.6 nm from Tern Island tower. You steer 286°T at 5.8 kn until 1630, then 153°T at 9.3 kn until 1705.

   Give the 1705 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 1245 you fix your position 111°T, 1.9 nm from Westfield church spire. You steer 132°T at 6.0 kn until 1330, then 300°T at 7.1 kn until 1345.

   Give the 1345 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