Worksheet 478 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 053°T, 2.9 nm from Gannet Rock daybeacon. You steer 030°T at 9.3 kn until 1545, then 184°T at 4.5 kn until 1600.

   Give the 1600 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  

2. At 1510 you fix your position 089°T, 3.2 nm from Westfield church spire. You steer 211°T at 4.3 kn until 1550, then 031°T at 8.0 kn until 1615.

   Give the 1615 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 0900 you fix your position 354°T, 1.4 nm from Kittle water tank. You steer 282°T at 7.2 kn until 0935, then 093°T at 4.5 kn until 1000.

   Give the 1000 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 0735 you fix your position 175°T, 1.1 nm from Gannet Rock daybeacon. You steer 298°T at 7.2 kn until 0745, then 331°T at 6.1 kn until 0755.

   Give the 0755 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 1400 you fix your position 357°T, 1.5 nm from Gannet Rock daybeacon. You steer 155°T at 6.6 kn until 1425, then 285°T at 9.7 kn until 1450.

   Give the 1450 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 1220 you fix your position 330°T, 2.2 nm from Tern Island tower. You steer 114°T at 9.7 kn until 1245, then 162°T at 4.1 kn until 1305.

   Give the 1305 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 0950 you fix your position 296°T, 1.6 nm from Gannet Rock daybeacon. You steer 215°T at 6.1 kn until 1015, then 296°T at 8.4 kn until 1035.

   Give the 1035 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  

8. At 1320 you fix your position 304°T, 3.5 nm from Tern Island tower. You steer 176°T at 7.4 kn until 1355, then 005°T at 9.1 kn until 1415.

   Give the 1415 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