Worksheet 630 · Skill 3

Dead reckoning

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1. At 1005 you fix your position 028°T, 2.3 nm from Mill stack. You steer 331°T at 4.8 kn until 1025, then 176°T at 4.0 kn until 1050.

   Give the 1050 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  

2. At 1205 you fix your position 077°T, 1.3 nm from Westfield church spire. You steer 324°T at 4.2 kn until 1240, then 146°T at 7.0 kn until 1320.

   Give the 1320 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 1600 you fix your position 225°T, 1.8 nm from Gannet Rock daybeacon. You steer 005°T at 6.7 kn until 1610, then 199°T at 5.3 kn until 1625.

   Give the 1625 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 1455 you fix your position 069°T, 1.9 nm from Heron Point Light. You steer 103°T at 9.0 kn until 1520, then 260°T at 8.0 kn until 1535.

   Give the 1535 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 1130 you fix your position 042°T, 3.0 nm from Gannet Rock daybeacon. You steer 310°T at 4.6 kn until 1140, then 168°T at 4.1 kn until 1200.

   Give the 1200 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 1040 you fix your position 104°T, 1.5 nm from Westfield church spire. You steer 055°T at 6.1 kn until 1125, then 199°T at 4.8 kn until 1135.

   Give the 1135 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 1405 you fix your position 004°T, 1.9 nm from Gannet Rock daybeacon. You steer 338°T at 5.5 kn until 1425, then 170°T at 4.5 kn until 1440.

   Give the 1440 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 1455 you fix your position 083°T, 1.7 nm from Gannet Rock daybeacon. You steer 181°T at 9.6 kn until 1505, then 353°T at 4.9 kn until 1535.

   Give the 1535 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