Worksheet 253 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 035°T, 2.9 nm from Westfield church spire. You steer 186°T at 6.1 kn until 1510, then 225°T at 4.4 kn until 1520.

   Give the 1520 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  

2. At 1125 you fix your position 059°T, 2.9 nm from Westfield church spire. You steer 151°T at 8.5 kn until 1145, then 023°T at 5.8 kn until 1200.

   Give the 1200 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  

3. At 1135 you fix your position 201°T, 2.7 nm from Tern Island tower. You steer 245°T at 4.5 kn until 1200, then 339°T at 7.6 kn until 1240.

   Give the 1240 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 1455 you fix your position 035°T, 3.4 nm from Heron Point Light. You steer 102°T at 9.5 kn until 1505, then 346°T at 5.9 kn until 1520.

   Give the 1520 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 0730 you fix your position 218°T, 2.5 nm from Tern Island tower. You steer 318°T at 6.5 kn until 0800, then 286°T at 6.1 kn until 0825.

   Give the 0825 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  

6. At 1130 you fix your position 010°T, 2.1 nm from Mill stack. You steer 027°T at 7.2 kn until 1145, then 148°T at 4.9 kn until 1210.

   Give the 1210 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 0945 you fix your position 051°T, 2.5 nm from Mill stack. You steer 324°T at 7.2 kn until 1005, then 251°T at 7.0 kn until 1020.

   Give the 1020 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 1545 you fix your position 170°T, 1.7 nm from Tern Island tower. You steer 197°T at 4.7 kn until 1610, then 072°T at 6.7 kn until 1625.

   Give the 1625 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