Worksheet 741 · Skill 3

Dead reckoning

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1. At 1500 you fix your position 222°T, 2.4 nm from Tern Island tower. You steer 204°T at 5.5 kn until 1515, then 009°T at 8.4 kn until 1535.

   Give the 1535 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 0935 you fix your position 031°T, 2.1 nm from Heron Point Light. You steer 353°T at 7.5 kn until 1010, then 103°T at 5.5 kn until 1035.

   Give the 1035 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 0900 you fix your position 026°T, 0.9 nm from Gannet Rock daybeacon. You steer 164°T at 9.5 kn until 0915, then 032°T at 4.1 kn until 0950.

   Give the 0950 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 1000 you fix your position 297°T, 2.1 nm from Tern Island tower. You steer 075°T at 5.3 kn until 1015, then 265°T at 7.6 kn until 1025.

   Give the 1025 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 0930 you fix your position 009°T, 1.5 nm from Westfield church spire. You steer 131°T at 6.0 kn until 1005, then 250°T at 9.3 kn until 1015.

   Give the 1015 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  

6. At 1520 you fix your position 058°T, 3.1 nm from Tern Island tower. You steer 111°T at 6.2 kn until 1545, then 232°T at 9.7 kn until 1620.

   Give the 1620 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 1335 you fix your position 218°T, 2.4 nm from Tern Island tower. You steer 079°T at 7.6 kn until 1415, then 340°T at 4.9 kn until 1430.

   Give the 1430 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 1430 you fix your position 279°T, 2.8 nm from Tern Island tower. You steer 232°T at 4.3 kn until 1455, then 100°T at 5.6 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