Worksheet 794 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 049°T, 4.0 nm from Westfield church spire. You steer 136°T at 10.0 kn until 1045, then 203°T at 4.8 kn until 1105.

   Give the 1105 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 1240 you fix your position 041°T, 2.3 nm from Heron Point Light. You steer 151°T at 9.1 kn until 1300, then 022°T at 9.9 kn until 1325.

   Give the 1325 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 1310 you fix your position 045°T, 4.2 nm from Gannet Rock daybeacon. You steer 237°T at 8.7 kn until 1325, then 160°T at 8.0 kn until 1335.

   Give the 1335 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  

4. At 1045 you fix your position 045°T, 3.3 nm from Westfield church spire. You steer 047°T at 8.2 kn until 1055, then 243°T at 9.3 kn until 1115.

   Give the 1115 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 0730 you fix your position 358°T, 1.0 nm from Heron Point Light. You steer 351°T at 6.4 kn until 0745, then 048°T at 7.7 kn until 0825.

   Give the 0825 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 120°T, 1.8 nm from Westfield church spire. You steer 061°T at 6.7 kn until 1015, then 330°T at 6.0 kn until 1030.

   Give the 1030 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 1020 you fix your position 249°T, 2.2 nm from Gannet Rock daybeacon. You steer 247°T at 4.2 kn until 1040, then 037°T at 5.5 kn until 1055.

   Give the 1055 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 0955 you fix your position 275°T, 3.4 nm from Tern Island tower. You steer 149°T at 4.2 kn until 1020, then 302°T at 5.4 kn until 1050.

   Give the 1050 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