Worksheet 287 · Skill 3

Dead reckoning

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1. At 0905 you fix your position 281°T, 1.3 nm from Gannet Rock daybeacon. You steer 298°T at 5.7 kn until 0945, then 198°T at 4.4 kn until 1015.

   Give the 1015 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  

2. At 0755 you fix your position 290°T, 1.1 nm from Gannet Rock daybeacon. You steer 252°T at 4.2 kn until 0810, then 080°T at 4.8 kn until 0820.

   Give the 0820 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  

3. At 1125 you fix your position 268°T, 2.4 nm from Gannet Rock daybeacon. You steer 334°T at 8.8 kn until 1200, then 154°T at 4.0 kn until 1230.

   Give the 1230 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 1545 you fix your position 271°T, 3.6 nm from Tern Island tower. You steer 254°T at 6.4 kn until 1555, then 216°T at 7.7 kn until 1620.

   Give the 1620 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  

5. At 1320 you fix your position 051°T, 1.4 nm from Gannet Rock daybeacon. You steer 316°T at 5.4 kn until 1330, then 094°T at 4.3 kn until 1405.

   Give the 1405 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 1125 you fix your position 083°T, 3.1 nm from Tern Island tower. You steer 301°T at 7.7 kn until 1140, then 159°T at 7.2 kn until 1225.

   Give the 1225 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  

7. At 1455 you fix your position 030°T, 1.0 nm from Kittle water tank. You steer 291°T at 6.6 kn until 1510, then 044°T at 5.3 kn until 1555.

   Give the 1555 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 1120 you fix your position 002°T, 1.3 nm from Westfield church spire. You steer 129°T at 5.6 kn until 1135, then 020°T at 9.9 kn until 1150.

   Give the 1150 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