Worksheet 224 · Skill 3

Dead reckoning

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1. At 0800 you fix your position 212°T, 2.5 nm from Tern Island tower. You steer 167°T at 5.0 kn until 0815, then 119°T at 8.6 kn until 0825.

   Give the 0825 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  

2. At 1410 you fix your position 042°T, 2.0 nm from Kittle water tank. You steer 342°T at 8.3 kn until 1445, then 235°T at 6.3 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  

3. At 1015 you fix your position 300°T, 3.8 nm from Tern Island tower. You steer 191°T at 7.5 kn until 1040, then 106°T at 7.5 kn until 1100.

   Give the 1100 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 1210 you fix your position 252°T, 1.8 nm from Tern Island tower. You steer 112°T at 9.2 kn until 1230, then 293°T at 8.3 kn until 1240.

   Give the 1240 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 1520 you fix your position 033°T, 3.4 nm from Gannet Rock daybeacon. You steer 318°T at 4.8 kn until 1550, then 251°T at 7.9 kn until 1605.

   Give the 1605 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 1045 you fix your position 046°T, 2.3 nm from Heron Point Light. You steer 326°T at 5.8 kn until 1105, then 095°T at 8.8 kn until 1145.

   Give the 1145 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 0820 you fix your position 289°T, 1.3 nm from Gannet Rock daybeacon. You steer 239°T at 7.3 kn until 0900, then 333°T at 9.7 kn until 0945.

   Give the 0945 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 0945 you fix your position 283°T, 3.8 nm from Tern Island tower. You steer 187°T at 4.4 kn until 1015, then 291°T at 7.9 kn until 1040.

   Give the 1040 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