Worksheet 400 · Skill 3

Dead reckoning

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1. At 1025 you fix your position 054°T, 3.6 nm from Westfield church spire. You steer 191°T at 6.0 kn until 1045, then 245°T at 4.3 kn until 1055.

   Give the 1055 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 1215 you fix your position 291°T, 4.1 nm from Tern Island tower. You steer 165°T at 9.2 kn until 1235, then 099°T at 6.7 kn until 1310.

   Give the 1310 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  

3. At 1230 you fix your position 281°T, 3.8 nm from Tern Island tower. You steer 191°T at 8.1 kn until 1305, then 345°T at 7.7 kn until 1325.

   Give the 1325 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  

4. At 1255 you fix your position 078°T, 2.3 nm from Gannet Rock daybeacon. You steer 235°T at 4.2 kn until 1340, then 061°T at 7.6 kn until 1355.

   Give the 1355 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  

5. At 1305 you fix your position 091°T, 2.5 nm from Westfield church spire. You steer 175°T at 4.1 kn until 1330, then 034°T at 8.7 kn until 1400.

   Give the 1400 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 0835 you fix your position 009°T, 1.5 nm from Mill stack. You steer 022°T at 9.2 kn until 0855, then 064°T at 8.5 kn until 0905.

   Give the 0905 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 1205 you fix your position 021°T, 1.9 nm from Tern Island tower. You steer 103°T at 9.2 kn until 1220, then 195°T at 4.6 kn until 1255.

   Give the 1255 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 1555 you fix your position 033°T, 4.0 nm from Westfield church spire. You steer 097°T at 5.3 kn until 1615, then 195°T at 9.0 kn until 1645.

   Give the 1645 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