Worksheet 729 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 060°T, 3.2 nm from Heron Point Light. You steer 162°T at 6.4 kn until 0825, then 028°T at 9.3 kn until 0835.

   Give the 0835 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 1435 you fix your position 007°T, 2.5 nm from Tern Island tower. You steer 118°T at 7.3 kn until 1515, then 271°T at 6.8 kn until 1540.

   Give the 1540 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 070°T, 2.7 nm from Gannet Rock daybeacon. You steer 177°T at 4.4 kn until 1205, then 347°T at 5.8 kn until 1235.

   Give the 1235 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 1225 you fix your position 030°T, 3.2 nm from Gannet Rock daybeacon. You steer 173°T at 6.0 kn until 1310, then 303°T at 7.3 kn until 1320.

   Give the 1320 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 0720 you fix your position 041°T, 3.0 nm from Gannet Rock daybeacon. You steer 021°T at 9.3 kn until 0730, then 154°T at 7.2 kn until 0740.

   Give the 0740 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 0820 you fix your position 325°T, 2.3 nm from Mill stack. You steer 140°T at 4.8 kn until 0835, then 060°T at 5.2 kn until 0910.

   Give the 0910 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 0850 you fix your position 241°T, 2.6 nm from Tern Island tower. You steer 357°T at 5.1 kn until 0935, then 185°T at 6.9 kn until 1020.

   Give the 1020 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  

8. At 1410 you fix your position 086°T, 2.2 nm from Heron Point Light. You steer 181°T at 4.3 kn until 1420, then 018°T at 6.5 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