Worksheet 397 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 054°T, 1.2 nm from Gannet Rock daybeacon. You steer 019°T at 6.0 kn until 1300, then 194°T at 6.0 kn until 1310.

   Give the 1310 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 1440 you fix your position 095°T, 3.5 nm from Westfield church spire. You steer 176°T at 4.6 kn until 1450, then 355°T at 6.3 kn until 1530.

   Give the 1530 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 1310 you fix your position 034°T, 2.4 nm from Gannet Rock daybeacon. You steer 262°T at 7.1 kn until 1320, then 330°T at 6.8 kn until 1345.

   Give the 1345 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 1405 you fix your position 089°T, 2.1 nm from Tern Island tower. You steer 221°T at 8.9 kn until 1425, then 123°T at 4.2 kn until 1455.

   Give the 1455 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 1255 you fix your position 268°T, 2.2 nm from Gannet Rock daybeacon. You steer 104°T at 6.6 kn until 1315, then 064°T at 9.9 kn until 1335.

   Give the 1335 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  

6. At 1005 you fix your position 327°T, 1.8 nm from Tern Island tower. You steer 104°T at 4.1 kn until 1030, then 042°T at 4.3 kn until 1040.

   Give the 1040 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 0900 you fix your position 068°T, 1.3 nm from Gannet Rock daybeacon. You steer 173°T at 7.5 kn until 0915, then 264°T at 8.3 kn until 0930.

   Give the 0930 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 1020 you fix your position 021°T, 1.2 nm from Westfield church spire. You steer 021°T at 4.6 kn until 1055, then 143°T at 6.2 kn until 1125.

   Give the 1125 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