Worksheet 587 · Skill 3

Dead reckoning

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1. At 1410 you fix your position 036°T, 1.9 nm from Tern Island tower. You steer 157°T at 8.2 kn until 1435, then 273°T at 7.4 kn until 1515.

   Give the 1515 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 1235 you fix your position 013°T, 2.0 nm from Kittle water tank. You steer 252°T at 7.6 kn until 1255, then 001°T at 9.8 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  

3. At 1105 you fix your position 083°T, 0.9 nm from Heron Point Light. You steer 035°T at 7.2 kn until 1150, then 169°T at 7.4 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  

4. At 1135 you fix your position 066°T, 3.2 nm from Westfield church spire. You steer 348°T at 6.7 kn until 1150, then 185°T at 8.5 kn until 1225.

   Give the 1225 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  

5. At 0835 you fix your position 288°T, 2.3 nm from Tern Island tower. You steer 186°T at 7.4 kn until 0900, then 313°T at 6.4 kn until 0930.

   Give the 0930 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 0920 you fix your position 056°T, 3.3 nm from Gannet Rock daybeacon. You steer 298°T at 6.8 kn until 0955, then 128°T at 7.2 kn until 1035.

   Give the 1035 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 0920 you fix your position 040°T, 4.7 nm from Westfield church spire. You steer 189°T at 6.3 kn until 0955, then 116°T at 7.2 kn until 1010.

   Give the 1010 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  

8. At 1450 you fix your position 066°T, 2.9 nm from Heron Point Light. You steer 309°T at 5.1 kn until 1505, then 002°T at 5.2 kn until 1515.

   Give the 1515 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