Worksheet 187 · Skill 3

Dead reckoning

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1. At 1140 you fix your position 017°T, 1.3 nm from Gannet Rock daybeacon. You steer 112°T at 6.4 kn until 1205, then 208°T at 4.4 kn until 1225.

   Give the 1225 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  

2. At 1350 you fix your position 084°T, 2.6 nm from Gannet Rock daybeacon. You steer 195°T at 4.1 kn until 1410, then 359°T at 8.1 kn until 1425.

   Give the 1425 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 0925 you fix your position 027°T, 2.6 nm from Heron Point Light. You steer 115°T at 8.4 kn until 0955, then 010°T at 4.3 kn until 1005.

   Give the 1005 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 1425 you fix your position 103°T, 2.5 nm from Gannet Rock daybeacon. You steer 324°T at 9.0 kn until 1500, then 067°T at 5.7 kn until 1510.

   Give the 1510 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 1535 you fix your position 191°T, 1.5 nm from Tern Island tower. You steer 274°T at 9.6 kn until 1610, then 113°T at 4.9 kn until 1655.

   Give the 1655 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 0810 you fix your position 032°T, 2.1 nm from Mill stack. You steer 064°T at 6.0 kn until 0850, then 216°T at 4.6 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  

7. At 1055 you fix your position 258°T, 2.0 nm from Tern Island tower. You steer 230°T at 7.2 kn until 1110, then 321°T at 6.6 kn until 1140.

   Give the 1140 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  

8. At 0810 you fix your position 242°T, 2.2 nm from Gannet Rock daybeacon. You steer 317°T at 4.7 kn until 0830, then 091°T at 5.9 kn until 0845.

   Give the 0845 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