Worksheet 734 · Skill 3

Dead reckoning

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1. At 0810 you fix your position 291°T, 3.8 nm from Tern Island tower. You steer 136°T at 4.1 kn until 0835, then 061°T at 7.2 kn until 0855.

   Give the 0855 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 1100 you fix your position 000°T, 2.8 nm from Mill stack. You steer 035°T at 4.3 kn until 1130, then 169°T at 6.5 kn until 1155.

   Give the 1155 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 1120 you fix your position 090°T, 2.4 nm from Gannet Rock daybeacon. You steer 352°T at 8.4 kn until 1150, then 057°T at 8.3 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  

4. At 1530 you fix your position 051°T, 3.9 nm from Westfield church spire. You steer 180°T at 5.5 kn until 1605, then 081°T at 9.6 kn until 1635.

   Give the 1635 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 1425 you fix your position 097°T, 1.6 nm from Heron Point Light. You steer 001°T at 8.3 kn until 1500, then 210°T at 9.3 kn until 1515.

   Give the 1515 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 1400 you fix your position 050°T, 3.5 nm from Tern Island tower. You steer 161°T at 10.0 kn until 1420, then 016°T at 7.0 kn until 1430.

   Give the 1430 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 1200 you fix your position 266°T, 2.8 nm from Tern Island tower. You steer 010°T at 6.8 kn until 1220, then 092°T at 10.0 kn until 1245.

   Give the 1245 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 1400 you fix your position 022°T, 2.2 nm from Kittle water tank. You steer 244°T at 5.5 kn until 1445, then 356°T at 9.3 kn until 1510.

   Give the 1510 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