Worksheet 331 · Skill 3

Dead reckoning

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1. At 0910 you fix your position 345°T, 1.6 nm from Tern Island tower. You steer 088°T at 9.5 kn until 0935, then 052°T at 5.5 kn until 0945.

   Give the 0945 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 0750 you fix your position 209°T, 3.1 nm from Tern Island tower. You steer 357°T at 6.7 kn until 0825, then 183°T at 5.4 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  

3. At 1440 you fix your position 027°T, 1.5 nm from Heron Point Light. You steer 089°T at 6.6 kn until 1505, then 328°T at 5.1 kn until 1530.

   Give the 1530 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 1045 you fix your position 302°T, 4.4 nm from Tern Island tower. You steer 168°T at 9.6 kn until 1110, then 092°T at 7.4 kn until 1130.

   Give the 1130 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 1325 you fix your position 000°T, 2.1 nm from Westfield church spire. You steer 092°T at 6.6 kn until 1340, then 322°T at 5.8 kn until 1355.

   Give the 1355 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  

6. At 1035 you fix your position 180°T, 1.8 nm from Gannet Rock daybeacon. You steer 282°T at 5.0 kn until 1100, then 312°T at 5.8 kn until 1120.

   Give the 1120 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 1115 you fix your position 251°T, 3.1 nm from Tern Island tower. You steer 217°T at 4.6 kn until 1145, then 291°T at 6.4 kn until 1205.

   Give the 1205 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  

8. At 1420 you fix your position 005°T, 1.5 nm from Gannet Rock daybeacon. You steer 325°T at 5.2 kn until 1430, then 203°T at 6.3 kn until 1445.

   Give the 1445 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