Worksheet 453 · Skill 3

Dead reckoning

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1. At 1125 you fix your position 003°T, 2.2 nm from Westfield church spire. You steer 077°T at 9.9 kn until 1145, then 219°T at 5.6 kn until 1225.

   Give the 1225 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 1330 you fix your position 155°T, 1.8 nm from Westfield church spire. You steer 041°T at 7.9 kn until 1350, then 271°T at 5.3 kn until 1400.

   Give the 1400 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 1020 you fix your position 089°T, 3.0 nm from Westfield church spire. You steer 037°T at 4.8 kn until 1045, then 358°T at 5.0 kn until 1105.

   Give the 1105 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 1315 you fix your position 268°T, 1.8 nm from Gannet Rock daybeacon. You steer 238°T at 6.1 kn until 1350, then 309°T at 8.2 kn until 1420.

   Give the 1420 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 0925 you fix your position 016°T, 2.6 nm from Westfield church spire. You steer 349°T at 4.7 kn until 0940, then 126°T at 6.1 kn until 1000.

   Give the 1000 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 0835 you fix your position 017°T, 1.5 nm from Westfield church spire. You steer 159°T at 4.3 kn until 0850, then 060°T at 4.1 kn until 0905.

   Give the 0905 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 0725 you fix your position 148°T, 3.2 nm from Westfield church spire. You steer 085°T at 8.1 kn until 0750, then 330°T at 5.8 kn until 0830.

   Give the 0830 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  

8. At 1125 you fix your position 027°T, 3.1 nm from Heron Point Light. You steer 120°T at 6.9 kn until 1210, then 273°T at 9.9 kn until 1235.

   Give the 1235 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