Worksheet 216 · Skill 3

Dead reckoning

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1. At 1340 you fix your position 019°T, 2.5 nm from Tern Island tower. You steer 167°T at 4.7 kn until 1400, then 332°T at 4.1 kn until 1420.

   Give the 1420 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 0835 you fix your position 245°T, 3.5 nm from Tern Island tower. You steer 106°T at 7.2 kn until 0900, then 211°T at 8.6 kn until 0925.

   Give the 0925 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  

3. At 1300 you fix your position 275°T, 2.2 nm from Gannet Rock daybeacon. You steer 104°T at 5.5 kn until 1310, then 067°T at 9.2 kn until 1325.

   Give the 1325 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 1310 you fix your position 296°T, 1.5 nm from Gannet Rock daybeacon. You steer 254°T at 4.1 kn until 1355, then 009°T at 5.9 kn until 1430.

   Give the 1430 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 1220 you fix your position 023°T, 2.5 nm from Mill stack. You steer 040°T at 9.2 kn until 1300, then 106°T at 4.1 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  

6. At 1220 you fix your position 204°T, 2.2 nm from Tern Island tower. You steer 060°T at 10.0 kn until 1240, then 328°T at 5.6 kn until 1250.

   Give the 1250 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 1550 you fix your position 045°T, 3.5 nm from Heron Point Light. You steer 088°T at 8.0 kn until 1600, then 155°T at 5.3 kn until 1640.

   Give the 1640 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  

8. At 1030 you fix your position 071°T, 4.2 nm from Tern Island tower. You steer 234°T at 6.2 kn until 1040, then 320°T at 6.9 kn until 1050.

   Give the 1050 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