Worksheet 181 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 300°T, 2.7 nm from Tern Island tower. You steer 237°T at 6.5 kn until 1040, then 076°T at 4.6 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  

2. At 1015 you fix your position 320°T, 1.5 nm from Kittle water tank. You steer 295°T at 6.2 kn until 1055, then 333°T at 7.1 kn until 1130.

   Give the 1130 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  

3. At 1120 you fix your position 295°T, 1.4 nm from Gannet Rock daybeacon. You steer 295°T at 5.8 kn until 1140, then 218°T at 6.0 kn until 1220.

   Give the 1220 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  

4. At 1540 you fix your position 044°T, 2.2 nm from Westfield church spire. You steer 170°T at 9.3 kn until 1600, then 074°T at 7.5 kn until 1640.

   Give the 1640 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 0825 you fix your position 012°T, 1.9 nm from Mill stack. You steer 324°T at 5.8 kn until 0845, then 290°T at 9.9 kn until 0905.

   Give the 0905 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 1050 you fix your position 082°T, 3.4 nm from Westfield church spire. You steer 239°T at 8.1 kn until 1110, then 064°T at 9.9 kn until 1135.

   Give the 1135 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 1425 you fix your position 061°T, 1.5 nm from Tern Island tower. You steer 048°T at 5.3 kn until 1445, then 121°T at 5.6 kn until 1510.

   Give the 1510 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 0815 you fix your position 065°T, 3.3 nm from Westfield church spire. You steer 304°T at 6.9 kn until 0840, then 174°T at 7.4 kn until 0920.

   Give the 0920 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