Worksheet 736 · Skill 3

Dead reckoning

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1. At 0810 you fix your position 314°T, 3.4 nm from Tern Island tower. You steer 149°T at 9.0 kn until 0820, then 246°T at 5.7 kn until 0855.

   Give the 0855 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  

2. At 1215 you fix your position 315°T, 2.4 nm from Tern Island tower. You steer 235°T at 6.7 kn until 1240, then 175°T at 5.1 kn until 1305.

   Give the 1305 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  

3. At 1525 you fix your position 079°T, 2.0 nm from Westfield church spire. You steer 056°T at 5.8 kn until 1600, then 162°T at 4.3 kn until 1635.

   Give the 1635 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 1240 you fix your position 221°T, 2.7 nm from Tern Island tower. You steer 082°T at 5.4 kn until 1325, then 179°T at 4.7 kn until 1400.

   Give the 1400 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  

5. At 1440 you fix your position 101°T, 2.3 nm from Westfield church spire. You steer 174°T at 6.5 kn until 1500, then 050°T at 5.9 kn until 1525.

   Give the 1525 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 0705 you fix your position 029°T, 1.7 nm from Heron Point Light. You steer 115°T at 5.7 kn until 0745, then 050°T at 5.7 kn until 0810.

   Give the 0810 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 1600 you fix your position 009°T, 2.3 nm from Heron Point Light. You steer 324°T at 5.5 kn until 1635, then 141°T at 9.7 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  

8. At 0930 you fix your position 262°T, 1.6 nm from Gannet Rock daybeacon. You steer 101°T at 5.3 kn until 1005, then 040°T at 6.2 kn until 1030.

   Give the 1030 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