Worksheet 284 · Skill 3

Dead reckoning

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1. At 0905 you fix your position 061°T, 3.1 nm from Tern Island tower. You steer 262°T at 4.7 kn until 0920, then 183°T at 7.8 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  

2. At 0940 you fix your position 063°T, 2.6 nm from Westfield church spire. You steer 164°T at 4.4 kn until 1000, then 343°T at 4.6 kn until 1030.

   Give the 1030 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  

3. At 1355 you fix your position 167°T, 0.9 nm from Gannet Rock daybeacon. You steer 023°T at 6.5 kn until 1440, then 083°T at 5.1 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  

4. At 1555 you fix your position 129°T, 1.4 nm from Tern Island tower. You steer 236°T at 7.5 kn until 1635, then 085°T at 5.2 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  

5. At 1540 you fix your position 058°T, 2.8 nm from Gannet Rock daybeacon. You steer 248°T at 9.4 kn until 1620, then 316°T at 7.8 kn until 1640.

   Give the 1640 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  

6. At 0745 you fix your position 154°T, 1.4 nm from Gannet Rock daybeacon. You steer 021°T at 4.1 kn until 0755, then 154°T at 5.0 kn until 0805.

   Give the 0805 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  

7. At 1015 you fix your position 073°T, 4.0 nm from Tern Island tower. You steer 187°T at 4.5 kn until 1050, then 295°T at 7.2 kn until 1105.

   Give the 1105 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 1550 you fix your position 186°T, 1.2 nm from Tern Island tower. You steer 199°T at 4.9 kn until 1620, then 292°T at 8.8 kn until 1650.

   Give the 1650 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