Worksheet 58 · Skill 3

Dead reckoning

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1. At 1005 you fix your position 196°T, 2.1 nm from Tern Island tower. You steer 211°T at 5.4 kn until 1025, then 018°T at 4.2 kn until 1050.

   Give the 1050 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  

2. At 0715 you fix your position 057°T, 3.3 nm from Westfield church spire. You steer 137°T at 5.1 kn until 0740, then 050°T at 5.2 kn until 0755.

   Give the 0755 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 1410 you fix your position 267°T, 3.0 nm from Tern Island tower. You steer 167°T at 5.5 kn until 1430, then 206°T at 7.4 kn until 1455.

   Give the 1455 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  

4. At 1225 you fix your position 040°T, 2.4 nm from Heron Point Light. You steer 336°T at 7.8 kn until 1305, then 160°T at 6.7 kn until 1320.

   Give the 1320 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 0940 you fix your position 013°T, 2.3 nm from Mill stack. You steer 299°T at 5.1 kn until 1010, then 043°T at 5.4 kn until 1045.

   Give the 1045 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  

6. At 0930 you fix your position 012°T, 2.2 nm from Heron Point Light. You steer 079°T at 8.4 kn until 1010, then 213°T at 5.9 kn until 1035.

   Give the 1035 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 0740 you fix your position 002°T, 2.2 nm from Mill stack. You steer 086°T at 8.2 kn until 0805, then 035°T at 5.2 kn until 0825.

   Give the 0825 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 0700 you fix your position 068°T, 2.7 nm from Heron Point Light. You steer 310°T at 4.8 kn until 0710, then 074°T at 9.4 kn until 0730.

   Give the 0730 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