Worksheet 353 · Skill 3

Dead reckoning

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1. At 1430 you fix your position 060°T, 2.5 nm from Westfield church spire. You steer 051°T at 7.6 kn until 1440, then 270°T at 5.6 kn until 1505.

   Give the 1505 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 1040 you fix your position 062°T, 1.6 nm from Westfield church spire. You steer 083°T at 7.6 kn until 1110, then 315°T at 6.4 kn until 1140.

   Give the 1140 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 0710 you fix your position 001°T, 1.9 nm from Mill stack. You steer 064°T at 7.7 kn until 0735, then 291°T at 7.1 kn until 0805.

   Give the 0805 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 1510 you fix your position 034°T, 2.8 nm from Westfield church spire. You steer 142°T at 5.4 kn until 1535, then 290°T at 8.7 kn until 1545.

   Give the 1545 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 1535 you fix your position 010°T, 1.8 nm from Heron Point Light. You steer 001°T at 5.7 kn until 1610, then 311°T at 6.2 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  

6. At 0955 you fix your position 031°T, 2.4 nm from Heron Point Light. You steer 124°T at 4.7 kn until 1040, then 034°T at 5.4 kn until 1120.

   Give the 1120 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 0745 you fix your position 101°T, 2.3 nm from Gannet Rock daybeacon. You steer 262°T at 5.4 kn until 0800, then 018°T at 6.0 kn until 0810.

   Give the 0810 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 1045 you fix your position 322°T, 1.9 nm from Mill stack. You steer 066°T at 4.4 kn until 1130, then 331°T at 6.7 kn until 1155.

   Give the 1155 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