Worksheet 8 · Skill 3

Dead reckoning

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1. At 1420 you fix your position 257°T, 1.4 nm from Tern Island tower. You steer 165°T at 5.3 kn until 1455, then 295°T at 9.5 kn until 1540.

   Give the 1540 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 0815 you fix your position 066°T, 3.7 nm from Tern Island tower. You steer 147°T at 5.0 kn until 0835, then 229°T at 4.2 kn until 0905.

   Give the 0905 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 1245 you fix your position 201°T, 1.9 nm from Tern Island tower. You steer 063°T at 8.1 kn until 1255, then 110°T at 7.9 kn until 1310.

   Give the 1310 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 1350 you fix your position 060°T, 1.4 nm from Gannet Rock daybeacon. You steer 090°T at 6.9 kn until 1400, then 326°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 1130 you fix your position 294°T, 4.1 nm from Tern Island tower. You steer 089°T at 6.3 kn until 1210, then 236°T at 7.7 kn until 1255.

   Give the 1255 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 1335 you fix your position 265°T, 1.8 nm from Gannet Rock daybeacon. You steer 314°T at 5.5 kn until 1345, then 266°T at 6.5 kn until 1355.

   Give the 1355 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 1550 you fix your position 297°T, 2.3 nm from Tern Island tower. You steer 180°T at 8.8 kn until 1615, then 076°T at 6.4 kn until 1650.

   Give the 1650 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  

8. At 1600 you fix your position 217°T, 1.5 nm from Tern Island tower. You steer 220°T at 7.9 kn until 1615, then 265°T at 8.5 kn until 1645.

   Give the 1645 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm