Worksheet 772 · Skill 3

Dead reckoning

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1. At 1540 you fix your position 057°T, 2.4 nm from Heron Point Light. You steer 117°T at 9.5 kn until 1550, then 356°T at 7.5 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  

2. At 0810 you fix your position 089°T, 1.7 nm from Tern Island tower. You steer 068°T at 5.4 kn until 0820, then 098°T at 4.1 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  

3. At 1310 you fix your position 068°T, 1.5 nm from Westfield church spire. You steer 096°T at 5.3 kn until 1320, then 315°T at 7.7 kn until 1335.

   Give the 1335 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 347°T, 1.0 nm from Kittle water tank. You steer 275°T at 9.5 kn until 0835, then 356°T at 9.3 kn until 0850.

   Give the 0850 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 0850 you fix your position 022°T, 2.7 nm from Heron Point Light. You steer 092°T at 5.3 kn until 0915, then 227°T at 5.7 kn until 0935.

   Give the 0935 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 1250 you fix your position 249°T, 1.4 nm from Tern Island tower. You steer 291°T at 5.2 kn until 1300, then 148°T at 8.5 kn until 1320.

   Give the 1320 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  

7. At 1300 you fix your position 031°T, 1.6 nm from Gannet Rock daybeacon. You steer 348°T at 8.5 kn until 1320, then 134°T at 9.2 kn until 1330.

   Give the 1330 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 1210 you fix your position 221°T, 1.3 nm from Tern Island tower. You steer 279°T at 5.3 kn until 1250, then 204°T at 4.4 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