Worksheet 537 · Skill 3

Dead reckoning

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1. At 1230 you fix your position 068°T, 3.6 nm from Westfield church spire. You steer 159°T at 9.1 kn until 1305, then 004°T at 7.8 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  

2. At 1335 you fix your position 056°T, 1.9 nm from Westfield church spire. You steer 058°T at 5.7 kn until 1420, then 250°T at 9.8 kn until 1430.

   Give the 1430 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 1245 you fix your position 008°T, 1.4 nm from Tern Island tower. You steer 097°T at 4.0 kn until 1320, then 155°T at 9.9 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 1350 you fix your position 179°T, 1.3 nm from Gannet Rock daybeacon. You steer 019°T at 7.1 kn until 1435, then 234°T at 5.0 kn until 1450.

   Give the 1450 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  

5. At 1430 you fix your position 069°T, 3.7 nm from Tern Island tower. You steer 237°T at 9.4 kn until 1440, then 289°T at 4.5 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  

6. At 1100 you fix your position 022°T, 1.8 nm from Mill stack. You steer 346°T at 8.2 kn until 1115, then 084°T at 4.9 kn until 1150.

   Give the 1150 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 1515 you fix your position 071°T, 4.2 nm from Tern Island tower. You steer 043°T at 8.1 kn until 1525, then 186°T at 8.0 kn until 1600.

   Give the 1600 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 1255 you fix your position 069°T, 2.2 nm from Heron Point Light. You steer 143°T at 6.6 kn until 1305, then 096°T at 7.3 kn until 1340.

   Give the 1340 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