Worksheet 105 · Skill 3

Dead reckoning

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1. At 1320 you fix your position 250°T, 1.6 nm from Gannet Rock daybeacon. You steer 318°T at 6.7 kn until 1345, then 255°T at 6.9 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  

2. At 1505 you fix your position 031°T, 1.0 nm from Westfield church spire. You steer 147°T at 8.7 kn until 1535, then 034°T at 6.3 kn until 1605.

   Give the 1605 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 1540 you fix your position 353°T, 1.9 nm from Heron Point Light. You steer 087°T at 4.9 kn until 1620, then 014°T at 4.8 kn until 1630.

   Give the 1630 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 0925 you fix your position 069°T, 2.7 nm from Gannet Rock daybeacon. You steer 170°T at 7.2 kn until 0945, then 004°T at 6.1 kn until 1025.

   Give the 1025 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 1240 you fix your position 237°T, 1.9 nm from Tern Island tower. You steer 284°T at 4.1 kn until 1250, then 233°T at 5.2 kn until 1310.

   Give the 1310 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  

6. At 1250 you fix your position 325°T, 2.3 nm from Tern Island tower. You steer 244°T at 9.8 kn until 1315, then 009°T at 8.8 kn until 1325.

   Give the 1325 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 0925 you fix your position 055°T, 3.0 nm from Westfield church spire. You steer 151°T at 4.3 kn until 0955, then 347°T at 5.5 kn until 1020.

   Give the 1020 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 1240 you fix your position 072°T, 0.9 nm from Gannet Rock daybeacon. You steer 152°T at 5.0 kn until 1250, then 015°T at 4.8 kn until 1300.

   Give the 1300 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