Worksheet 752 · Skill 3

Dead reckoning

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1. At 1305 you fix your position 278°T, 3.4 nm from Tern Island tower. You steer 085°T at 6.8 kn until 1315, then 294°T at 8.3 kn until 1350.

   Give the 1350 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  

2. At 0835 you fix your position 247°T, 2.8 nm from Tern Island tower. You steer 357°T at 9.6 kn until 0855, then 210°T at 9.2 kn until 0920.

   Give the 0920 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  

3. At 1105 you fix your position 082°T, 2.2 nm from Westfield church spire. You steer 139°T at 6.4 kn until 1120, then 093°T at 6.5 kn until 1135.

   Give the 1135 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 1330 you fix your position 128°T, 1.2 nm from Gannet Rock daybeacon. You steer 027°T at 6.3 kn until 1400, then 302°T at 5.6 kn until 1445.

   Give the 1445 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 1135 you fix your position 146°T, 1.3 nm from Gannet Rock daybeacon. You steer 297°T at 6.7 kn until 1150, then 218°T at 5.1 kn until 1225.

   Give the 1225 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

6. At 1350 you fix your position 058°T, 2.2 nm from Tern Island tower. You steer 336°T at 4.5 kn until 1405, then 162°T at 9.0 kn until 1435.

   Give the 1435 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 1330 you fix your position 289°T, 3.1 nm from Tern Island tower. You steer 189°T at 7.7 kn until 1415, then 082°T at 9.5 kn until 1430.

   Give the 1430 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

8. At 0905 you fix your position 220°T, 2.7 nm from Tern Island tower. You steer 076°T at 4.2 kn until 0930, then 217°T at 8.2 kn until 1000.

   Give the 1000 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm