Worksheet 558 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 248°T, 3.5 nm from Tern Island tower. You steer 047°T at 9.6 kn until 1415, then 306°T at 6.9 kn until 1425.

   Give the 1425 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 1255 you fix your position 123°T, 1.4 nm from Tern Island tower. You steer 091°T at 9.1 kn until 1320, then 228°T at 5.4 kn until 1350.

   Give the 1350 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 1400 you fix your position 313°T, 3.1 nm from Tern Island tower. You steer 236°T at 6.9 kn until 1410, then 066°T at 4.2 kn until 1445.

   Give the 1445 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 1420 you fix your position 298°T, 1.8 nm from Kittle water tank. You steer 293°T at 8.2 kn until 1430, then 060°T at 5.7 kn until 1515.

   Give the 1515 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 1125 you fix your position 034°T, 2.4 nm from Mill stack. You steer 326°T at 5.2 kn until 1145, then 112°T at 5.2 kn until 1215.

   Give the 1215 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 1450 you fix your position 001°T, 2.1 nm from Westfield church spire. You steer 110°T at 4.2 kn until 1530, then 175°T at 4.7 kn until 1615.

   Give the 1615 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 0700 you fix your position 220°T, 3.5 nm from Tern Island tower. You steer 001°T at 6.1 kn until 0710, then 289°T at 5.3 kn until 0730.

   Give the 0730 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  

8. At 0930 you fix your position 086°T, 1.1 nm from Heron Point Light. You steer 352°T at 4.8 kn until 1005, then 144°T at 7.0 kn until 1030.

   Give the 1030 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