Worksheet 413 · Skill 3

Dead reckoning

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1. At 1325 you fix your position 040°T, 3.5 nm from Gannet Rock daybeacon. You steer 227°T at 5.2 kn until 1335, then 262°T at 6.5 kn until 1345.

   Give the 1345 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 1030 you fix your position 111°T, 1.8 nm from Gannet Rock daybeacon. You steer 007°T at 4.0 kn until 1040, then 118°T at 5.6 kn until 1055.

   Give the 1055 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  

3. At 1545 you fix your position 269°T, 2.7 nm from Tern Island tower. You steer 214°T at 5.3 kn until 1610, then 011°T at 5.6 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  

4. At 0715 you fix your position 053°T, 3.7 nm from Westfield church spire. You steer 286°T at 5.3 kn until 0745, then 102°T at 5.7 kn until 0825.

   Give the 0825 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  

5. At 1055 you fix your position 266°T, 2.0 nm from Gannet Rock daybeacon. You steer 217°T at 5.0 kn until 1110, then 056°T at 9.1 kn until 1145.

   Give the 1145 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 1525 you fix your position 007°T, 3.4 nm from Westfield church spire. You steer 151°T at 6.0 kn until 1610, then 003°T at 4.8 kn until 1625.

   Give the 1625 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  

7. At 0955 you fix your position 005°T, 2.4 nm from Mill stack. You steer 063°T at 5.4 kn until 1005, then 283°T at 9.3 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 1305 you fix your position 034°T, 1.0 nm from Heron Point Light. You steer 009°T at 6.5 kn until 1325, then 048°T at 4.5 kn until 1355.

   Give the 1355 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