Worksheet 311 · Skill 3

Dead reckoning

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1. At 1300 you fix your position 092°T, 2.8 nm from Gannet Rock daybeacon. You steer 273°T at 7.5 kn until 1310, then 219°T at 4.8 kn until 1345.

   Give the 1345 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  

2. At 1055 you fix your position 241°T, 2.0 nm from Tern Island tower. You steer 102°T at 8.4 kn until 1125, then 019°T at 4.8 kn until 1210.

   Give the 1210 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 1600 you fix your position 272°T, 2.2 nm from Tern Island tower. You steer 234°T at 7.0 kn until 1635, then 101°T at 8.8 kn until 1705.

   Give the 1705 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 1030 you fix your position 245°T, 1.9 nm from Tern Island tower. You steer 208°T at 4.6 kn until 1040, then 131°T at 7.4 kn until 1100.

   Give the 1100 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 1420 you fix your position 063°T, 4.9 nm from Tern Island tower. You steer 275°T at 5.9 kn until 1445, then 159°T at 9.9 kn until 1525.

   Give the 1525 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  

6. At 1600 you fix your position 263°T, 3.2 nm from Gannet Rock daybeacon. You steer 317°T at 5.7 kn until 1640, then 140°T at 5.5 kn until 1650.

   Give the 1650 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 1225 you fix your position 089°T, 3.0 nm from Gannet Rock daybeacon. You steer 000°T at 6.6 kn until 1240, then 308°T at 6.2 kn until 1250.

   Give the 1250 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  

8. At 1105 you fix your position 013°T, 1.2 nm from Gannet Rock daybeacon. You steer 268°T at 7.7 kn until 1135, then 354°T at 4.2 kn until 1155.

   Give the 1155 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