Worksheet 623 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 291°T, 3.2 nm from Tern Island tower. You steer 163°T at 9.4 kn until 1105, then 295°T at 7.6 kn until 1125.

   Give the 1125 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 1250 you fix your position 057°T, 2.8 nm from Heron Point Light. You steer 000°T at 4.5 kn until 1330, then 310°T at 6.6 kn until 1405.

   Give the 1405 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 1215 you fix your position 016°T, 1.7 nm from Heron Point Light. You steer 044°T at 7.0 kn until 1240, then 112°T at 9.1 kn until 1300.

   Give the 1300 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 1225 you fix your position 086°T, 1.6 nm from Westfield church spire. You steer 086°T at 9.9 kn until 1240, then 256°T at 8.5 kn until 1305.

   Give the 1305 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 0855 you fix your position 313°T, 1.4 nm from Kittle water tank. You steer 037°T at 7.1 kn until 0920, then 208°T at 4.8 kn until 0930.

   Give the 0930 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  

6. At 1020 you fix your position 035°T, 2.3 nm from Gannet Rock daybeacon. You steer 063°T at 5.4 kn until 1035, then 358°T at 5.9 kn until 1055.

   Give the 1055 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  

7. At 1340 you fix your position 335°T, 1.0 nm from Gannet Rock daybeacon. You steer 077°T at 5.1 kn until 1415, then 229°T at 8.3 kn until 1455.

   Give the 1455 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  

8. At 0705 you fix your position 042°T, 3.4 nm from Heron Point Light. You steer 147°T at 6.3 kn until 0725, then 064°T at 6.7 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