Worksheet 646 · Skill 3

Dead reckoning

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1. At 1340 you fix your position 305°T, 1.4 nm from Gannet Rock daybeacon. You steer 030°T at 6.3 kn until 1405, then 102°T at 4.2 kn until 1420.

   Give the 1420 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 1230 you fix your position 243°T, 1.3 nm from Gannet Rock daybeacon. You steer 166°T at 9.4 kn until 1240, then 286°T at 8.9 kn until 1325.

   Give the 1325 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 1550 you fix your position 091°T, 1.2 nm from Heron Point Light. You steer 096°T at 8.2 kn until 1615, then 303°T at 4.8 kn until 1630.

   Give the 1630 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  

4. At 1255 you fix your position 068°T, 2.0 nm from Heron Point Light. You steer 057°T at 9.6 kn until 1320, then 170°T at 7.3 kn until 1340.

   Give the 1340 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 1430 you fix your position 030°T, 2.4 nm from Gannet Rock daybeacon. You steer 262°T at 4.0 kn until 1450, then 213°T at 5.7 kn until 1510.

   Give the 1510 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 1345 you fix your position 023°T, 2.6 nm from Mill stack. You steer 016°T at 7.1 kn until 1355, then 206°T at 9.6 kn until 1405.

   Give the 1405 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  

7. At 1020 you fix your position 251°T, 1.6 nm from Gannet Rock daybeacon. You steer 223°T at 5.4 kn until 1030, then 072°T at 9.2 kn until 1100.

   Give the 1100 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 1600 you fix your position 006°T, 1.9 nm from Heron Point Light. You steer 081°T at 5.7 kn until 1640, then 144°T at 4.3 kn until 1710.

   Give the 1710 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