Worksheet 244 · Skill 3

Dead reckoning

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1. At 1340 you fix your position 036°T, 2.2 nm from Heron Point Light. You steer 078°T at 4.8 kn until 1420, then 175°T at 4.8 kn until 1500.

   Give the 1500 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

2. At 1010 you fix your position 090°T, 1.5 nm from Westfield church spire. You steer 067°T at 6.2 kn until 1040, then 126°T at 9.2 kn until 1115.

   Give the 1115 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  

3. At 1230 you fix your position 088°T, 2.4 nm from Tern Island tower. You steer 350°T at 8.1 kn until 1245, then 212°T at 4.9 kn until 1305.

   Give the 1305 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 1410 you fix your position 076°T, 2.8 nm from Gannet Rock daybeacon. You steer 220°T at 4.3 kn until 1435, then 028°T at 4.3 kn until 1455.

   Give the 1455 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  

5. At 1245 you fix your position 264°T, 2.8 nm from Gannet Rock daybeacon. You steer 161°T at 9.8 kn until 1255, then 036°T at 8.8 kn until 1340.

   Give the 1340 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  

6. At 1050 you fix your position 237°T, 3.3 nm from Tern Island tower. You steer 301°T at 9.4 kn until 1100, then 116°T at 5.1 kn until 1120.

   Give the 1120 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 0805 you fix your position 112°T, 2.2 nm from Gannet Rock daybeacon. You steer 271°T at 9.4 kn until 0850, then 000°T at 8.6 kn until 0925.

   Give the 0925 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  

8. At 0735 you fix your position 110°T, 2.0 nm from Westfield church spire. You steer 071°T at 6.6 kn until 0755, then 135°T at 9.8 kn until 0810.

   Give the 0810 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