Worksheet 555 · Skill 3

Dead reckoning

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1. At 1220 you fix your position 100°T, 1.7 nm from Westfield church spire. You steer 038°T at 8.4 kn until 1235, then 171°T at 8.6 kn until 1250.

   Give the 1250 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 1420 you fix your position 054°T, 3.6 nm from Tern Island tower. You steer 182°T at 4.5 kn until 1445, then 301°T at 5.2 kn until 1455.

   Give the 1455 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 1325 you fix your position 060°T, 3.8 nm from Westfield church spire. You steer 125°T at 7.0 kn until 1335, then 057°T at 5.3 kn until 1345.

   Give the 1345 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 1015 you fix your position 186°T, 1.5 nm from Gannet Rock daybeacon. You steer 061°T at 5.1 kn until 1035, then 144°T at 6.1 kn until 1045.

   Give the 1045 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  

5. At 0935 you fix your position 299°T, 3.7 nm from Tern Island tower. You steer 238°T at 7.1 kn until 0950, then 197°T at 6.6 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  

6. At 1035 you fix your position 233°T, 3.5 nm from Tern Island tower. You steer 305°T at 8.6 kn until 1045, then 114°T at 4.5 kn until 1055.

   Give the 1055 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  

7. At 1310 you fix your position 336°T, 2.7 nm from Kittle water tank. You steer 061°T at 7.7 kn until 1325, then 281°T at 9.1 kn until 1345.

   Give the 1345 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 1345 you fix your position 029°T, 3.5 nm from Gannet Rock daybeacon. You steer 181°T at 4.7 kn until 1400, then 212°T at 4.1 kn until 1410.

   Give the 1410 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