Worksheet 117 · Skill 3

Dead reckoning

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1. At 1330 you fix your position 265°T, 2.0 nm from Tern Island tower. You steer 239°T at 6.1 kn until 1405, then 116°T at 8.3 kn until 1450.

   Give the 1450 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 1210 you fix your position 266°T, 2.9 nm from Gannet Rock daybeacon. You steer 281°T at 5.1 kn until 1220, then 180°T at 6.5 kn until 1230.

   Give the 1230 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

3. At 0740 you fix your position 331°T, 2.5 nm from Tern Island tower. You steer 198°T at 7.6 kn until 0810, then 022°T at 8.7 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  

4. At 0840 you fix your position 024°T, 2.6 nm from Tern Island tower. You steer 240°T at 7.8 kn until 0915, then 167°T at 6.7 kn until 0930.

   Give the 0930 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 1455 you fix your position 063°T, 3.2 nm from Heron Point Light. You steer 307°T at 4.1 kn until 1535, then 119°T at 7.9 kn until 1605.

   Give the 1605 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

6. At 1410 you fix your position 111°T, 1.4 nm from Gannet Rock daybeacon. You steer 241°T at 8.8 kn until 1435, then 063°T at 9.6 kn until 1450.

   Give the 1450 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 1555 you fix your position 071°T, 3.2 nm from Tern Island tower. You steer 275°T at 5.3 kn until 1620, then 025°T at 5.7 kn until 1630.

   Give the 1630 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 0950 you fix your position 095°T, 1.4 nm from Heron Point Light. You steer 027°T at 6.2 kn until 1035, then 205°T at 6.2 kn until 1115.

   Give the 1115 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