Worksheet 37 · Skill 3

Dead reckoning

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1. At 0740 you fix your position 257°T, 3.7 nm from Tern Island tower. You steer 065°T at 6.9 kn until 0750, then 117°T at 6.4 kn until 0805.

   Give the 0805 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 1550 you fix your position 005°T, 1.6 nm from Mill stack. You steer 002°T at 9.8 kn until 1615, then 145°T at 4.0 kn until 1655.

   Give the 1655 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 1145 you fix your position 296°T, 1.3 nm from Gannet Rock daybeacon. You steer 049°T at 9.1 kn until 1210, then 283°T at 8.4 kn until 1250.

   Give the 1250 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 1235 you fix your position 037°T, 1.9 nm from Heron Point Light. You steer 325°T at 10.0 kn until 1255, then 183°T at 7.6 kn until 1310.

   Give the 1310 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  

5. At 1140 you fix your position 248°T, 2.6 nm from Tern Island tower. You steer 245°T at 4.4 kn until 1210, then 092°T at 8.4 kn until 1250.

   Give the 1250 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  

6. At 1025 you fix your position 024°T, 1.7 nm from Gannet Rock daybeacon. You steer 083°T at 7.5 kn until 1035, then 357°T at 7.9 kn until 1045.

   Give the 1045 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 1225 you fix your position 236°T, 1.9 nm from Tern Island tower. You steer 180°T at 7.4 kn until 1245, then 014°T at 6.7 kn until 1305.

   Give the 1305 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 1105 you fix your position 240°T, 2.7 nm from Gannet Rock daybeacon. You steer 318°T at 7.3 kn until 1125, then 359°T at 8.2 kn until 1145.

   Give the 1145 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