Worksheet 103 · Skill 3

Dead reckoning

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1. At 1210 you fix your position 357°T, 2.4 nm from Mill stack. You steer 297°T at 7.1 kn until 1250, then 117°T at 6.6 kn until 1310.

   Give the 1310 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  

2. At 1455 you fix your position 202°T, 1.7 nm from Tern Island tower. You steer 316°T at 9.2 kn until 1520, then 199°T at 4.8 kn until 1530.

   Give the 1530 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 0910 you fix your position 193°T, 1.3 nm from Tern Island tower. You steer 149°T at 4.6 kn until 0935, then 022°T at 4.0 kn until 1015.

   Give the 1015 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 1510 you fix your position 248°T, 2.7 nm from Tern Island tower. You steer 318°T at 5.6 kn until 1525, then 038°T at 9.9 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  

5. At 0755 you fix your position 017°T, 2.1 nm from Gannet Rock daybeacon. You steer 148°T at 6.4 kn until 0835, then 268°T at 7.9 kn until 0850.

   Give the 0850 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 0800 you fix your position 226°T, 2.3 nm from Tern Island tower. You steer 281°T at 4.1 kn until 0840, then 092°T at 8.2 kn until 0910.

   Give the 0910 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 0715 you fix your position 224°T, 2.3 nm from Tern Island tower. You steer 294°T at 5.0 kn until 0730, then 028°T at 4.4 kn until 0745.

   Give the 0745 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  

8. At 1405 you fix your position 262°T, 2.4 nm from Gannet Rock daybeacon. You steer 047°T at 6.1 kn until 1450, then 332°T at 4.8 kn until 1505.

   Give the 1505 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