Worksheet 686 · Skill 3

Dead reckoning

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1. At 1120 you fix your position 320°T, 1.1 nm from Kittle water tank. You steer 062°T at 4.7 kn until 1150, then 188°T at 6.9 kn until 1200.

   Give the 1200 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  

2. At 0935 you fix your position 285°T, 1.8 nm from Gannet Rock daybeacon. You steer 284°T at 8.8 kn until 1015, then 056°T at 9.5 kn until 1030.

   Give the 1030 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 1115 you fix your position 328°T, 1.1 nm from Gannet Rock daybeacon. You steer 208°T at 6.1 kn until 1130, then 305°T at 5.5 kn until 1140.

   Give the 1140 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 1220 you fix your position 107°T, 2.0 nm from Westfield church spire. You steer 032°T at 4.8 kn until 1240, then 123°T at 7.0 kn until 1315.

   Give the 1315 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 1000 you fix your position 097°T, 1.9 nm from Tern Island tower. You steer 082°T at 9.0 kn until 1010, then 280°T at 7.8 kn until 1020.

   Give the 1020 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  

6. At 1010 you fix your position 034°T, 3.8 nm from Westfield church spire. You steer 161°T at 5.6 kn until 1025, then 015°T at 7.8 kn until 1035.

   Give the 1035 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  

7. At 1535 you fix your position 302°T, 1.3 nm from Tern Island tower. You steer 303°T at 7.0 kn until 1545, then 173°T at 9.7 kn until 1600.

   Give the 1600 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 1255 you fix your position 338°T, 2.6 nm from Tern Island tower. You steer 261°T at 6.8 kn until 1330, then 216°T at 10.0 kn until 1345.

   Give the 1345 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