Worksheet 387 · Skill 3

Dead reckoning

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1. At 0825 you fix your position 002°T, 2.0 nm from Tern Island tower. You steer 252°T at 9.9 kn until 0835, then 282°T at 8.1 kn until 0910.

   Give the 0910 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 1240 you fix your position 266°T, 2.7 nm from Tern Island tower. You steer 253°T at 6.4 kn until 1310, then 205°T at 6.6 kn until 1325.

   Give the 1325 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 0815 you fix your position 131°T, 3.0 nm from Tern Island tower. You steer 042°T at 6.1 kn until 0825, then 322°T at 6.4 kn until 0905.

   Give the 0905 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 1040 you fix your position 263°T, 2.0 nm from Gannet Rock daybeacon. You steer 096°T at 4.9 kn until 1115, then 224°T at 6.0 kn until 1140.

   Give the 1140 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

5. At 1450 you fix your position 265°T, 3.0 nm from Tern Island tower. You steer 174°T at 7.5 kn until 1520, then 299°T at 8.0 kn until 1540.

   Give the 1540 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  

6. At 0735 you fix your position 268°T, 2.2 nm from Tern Island tower. You steer 076°T at 4.4 kn until 0750, then 222°T at 7.0 kn until 0825.

   Give the 0825 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  

7. At 0825 you fix your position 243°T, 2.7 nm from Tern Island tower. You steer 343°T at 4.3 kn until 0835, then 129°T at 5.6 kn until 0915.

   Give the 0915 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 1135 you fix your position 025°T, 2.6 nm from Westfield church spire. You steer 035°T at 4.0 kn until 1145, then 090°T at 5.9 kn until 1210.

   Give the 1210 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