Worksheet 779 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 281°T, 1.6 nm from Gannet Rock daybeacon. You steer 271°T at 9.0 kn until 1100, then 212°T at 4.6 kn until 1110.

   Give the 1110 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  

2. At 1055 you fix your position 258°T, 2.0 nm from Gannet Rock daybeacon. You steer 203°T at 5.5 kn until 1115, then 250°T at 5.3 kn until 1125.

   Give the 1125 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

3. At 0905 you fix your position 080°T, 2.8 nm from Westfield church spire. You steer 131°T at 9.1 kn until 0940, then 335°T at 8.5 kn until 1015.

   Give the 1015 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 1220 you fix your position 241°T, 2.0 nm from Tern Island tower. You steer 130°T at 4.8 kn until 1300, then 204°T at 7.5 kn until 1315.

   Give the 1315 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

5. At 1010 you fix your position 056°T, 1.6 nm from Heron Point Light. You steer 355°T at 5.2 kn until 1025, then 111°T at 6.8 kn until 1045.

   Give the 1045 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

6. At 1055 you fix your position 006°T, 2.2 nm from Mill stack. You steer 311°T at 4.1 kn until 1110, then 103°T at 6.4 kn until 1155.

   Give the 1155 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  

7. At 0800 you fix your position 045°T, 4.1 nm from Westfield church spire. You steer 248°T at 6.0 kn until 0830, then 105°T at 4.7 kn until 0855.

   Give the 0855 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 1130 you fix your position 342°T, 2.7 nm from Mill stack. You steer 281°T at 4.3 kn until 1200, then 313°T at 6.9 kn until 1215.

   Give the 1215 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