Worksheet 312 · Skill 3

Dead reckoning

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1. At 0725 you fix your position 040°T, 2.8 nm from Westfield church spire. You steer 182°T at 4.7 kn until 0755, then 033°T at 6.7 kn until 0835.

   Give the 0835 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 1215 you fix your position 296°T, 2.6 nm from Tern Island tower. You steer 285°T at 8.7 kn until 1245, then 146°T at 9.9 kn until 1300.

   Give the 1300 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 0840 you fix your position 326°T, 3.0 nm from Kittle water tank. You steer 263°T at 7.0 kn until 0900, then 314°T at 6.8 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  

4. At 1305 you fix your position 019°T, 2.3 nm from Mill stack. You steer 342°T at 7.8 kn until 1325, then 180°T at 4.8 kn until 1355.

   Give the 1355 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

5. At 1545 you fix your position 004°T, 1.3 nm from Kittle water tank. You steer 248°T at 5.7 kn until 1610, then 353°T at 6.9 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  

6. At 1030 you fix your position 275°T, 2.3 nm from Gannet Rock daybeacon. You steer 320°T at 6.5 kn until 1115, then 075°T at 6.1 kn until 1150.

   Give the 1150 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 1145 you fix your position 116°T, 1.6 nm from Westfield church spire. You steer 049°T at 5.4 kn until 1225, then 171°T at 5.4 kn until 1240.

   Give the 1240 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 1310 you fix your position 077°T, 1.7 nm from Westfield church spire. You steer 142°T at 4.4 kn until 1325, then 087°T at 4.8 kn until 1400.

   Give the 1400 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