Worksheet 707 · Skill 3

Dead reckoning

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1. At 1245 you fix your position 211°T, 3.3 nm from Tern Island tower. You steer 231°T at 9.0 kn until 1305, then 311°T at 4.9 kn until 1330.

   Give the 1330 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  

2. At 1255 you fix your position 077°T, 2.0 nm from Heron Point Light. You steer 080°T at 8.8 kn until 1305, then 354°T at 9.9 kn until 1325.

   Give the 1325 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 1405 you fix your position 077°T, 1.4 nm from Westfield church spire. You steer 092°T at 4.8 kn until 1440, then 277°T at 7.6 kn until 1505.

   Give the 1505 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 0820 you fix your position 074°T, 3.3 nm from Westfield church spire. You steer 062°T at 7.7 kn until 0830, then 017°T at 8.9 kn until 0845.

   Give the 0845 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 1245 you fix your position 100°T, 2.6 nm from Gannet Rock daybeacon. You steer 009°T at 9.6 kn until 1300, then 335°T at 5.9 kn until 1310.

   Give the 1310 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 1330 you fix your position 239°T, 2.2 nm from Tern Island tower. You steer 251°T at 6.1 kn until 1400, then 315°T at 4.0 kn until 1430.

   Give the 1430 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  

7. At 0950 you fix your position 039°T, 2.8 nm from Tern Island tower. You steer 094°T at 7.7 kn until 1005, then 263°T at 7.1 kn until 1030.

   Give the 1030 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 1515 you fix your position 013°T, 1.6 nm from Westfield church spire. You steer 332°T at 5.2 kn until 1525, then 175°T at 5.7 kn until 1535.

   Give the 1535 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