Worksheet 173 · Skill 3

Dead reckoning

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1. At 1055 you fix your position 128°T, 1.9 nm from Westfield church spire. You steer 059°T at 5.3 kn until 1125, then 104°T at 9.9 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  

2. At 1250 you fix your position 041°T, 4.3 nm from Westfield church spire. You steer 163°T at 5.5 kn until 1320, then 321°T at 8.1 kn until 1340.

   Give the 1340 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 1510 you fix your position 176°T, 1.1 nm from Gannet Rock daybeacon. You steer 033°T at 6.5 kn until 1530, then 221°T at 8.4 kn until 1545.

   Give the 1545 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  

4. At 1325 you fix your position 343°T, 2.5 nm from Mill stack. You steer 100°T at 6.2 kn until 1400, then 352°T at 4.6 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 1405 you fix your position 224°T, 3.1 nm from Tern Island tower. You steer 217°T at 9.4 kn until 1425, then 038°T at 4.9 kn until 1505.

   Give the 1505 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 0935 you fix your position 067°T, 3.2 nm from Tern Island tower. You steer 050°T at 8.8 kn until 0945, then 204°T at 8.1 kn until 1020.

   Give the 1020 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 1055 you fix your position 278°T, 1.3 nm from Tern Island tower. You steer 255°T at 4.6 kn until 1115, then 326°T at 5.7 kn until 1125.

   Give the 1125 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 1125 you fix your position 304°T, 1.1 nm from Gannet Rock daybeacon. You steer 264°T at 5.3 kn until 1150, then 353°T at 8.9 kn until 1220.

   Give the 1220 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