Worksheet 549 · Skill 3

Dead reckoning

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1. At 1005 you fix your position 203°T, 2.3 nm from Tern Island tower. You steer 335°T at 4.1 kn until 1050, then 150°T at 5.8 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 1300 you fix your position 229°T, 3.0 nm from Tern Island tower. You steer 220°T at 7.6 kn until 1315, then 076°T at 5.0 kn until 1355.

   Give the 1355 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 0855 you fix your position 027°T, 3.5 nm from Heron Point Light. You steer 079°T at 4.0 kn until 0910, then 305°T at 7.8 kn until 0920.

   Give the 0920 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  

4. At 1425 you fix your position 273°T, 2.2 nm from Tern Island tower. You steer 281°T at 5.9 kn until 1435, then 125°T at 4.9 kn until 1445.

   Give the 1445 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 1515 you fix your position 027°T, 1.9 nm from Gannet Rock daybeacon. You steer 246°T at 6.1 kn until 1600, then 115°T at 8.9 kn until 1610.

   Give the 1610 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 1135 you fix your position 212°T, 2.4 nm from Gannet Rock daybeacon. You steer 337°T at 6.8 kn until 1150, then 262°T at 5.2 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  

7. At 1515 you fix your position 281°T, 1.3 nm from Tern Island tower. You steer 248°T at 5.9 kn until 1540, then 308°T at 4.2 kn until 1625.

   Give the 1625 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 1355 you fix your position 075°T, 1.4 nm from Gannet Rock daybeacon. You steer 325°T at 5.2 kn until 1440, then 013°T at 9.0 kn until 1450.

   Give the 1450 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