Worksheet 23 · Skill 3

Dead reckoning

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1. At 1315 you fix your position 308°T, 3.6 nm from Tern Island tower. You steer 107°T at 8.0 kn until 1355, then 290°T at 7.4 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  

2. At 1010 you fix your position 290°T, 3.4 nm from Tern Island tower. You steer 266°T at 7.8 kn until 1035, then 011°T at 7.6 kn until 1045.

   Give the 1045 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  

3. At 1240 you fix your position 048°T, 2.1 nm from Tern Island tower. You steer 295°T at 9.3 kn until 1255, then 243°T at 6.6 kn until 1330.

   Give the 1330 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 1330 you fix your position 093°T, 2.2 nm from Tern Island tower. You steer 020°T at 4.0 kn until 1410, then 240°T at 4.0 kn until 1435.

   Give the 1435 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 1355 you fix your position 262°T, 2.8 nm from Gannet Rock daybeacon. You steer 198°T at 6.9 kn until 1405, then 014°T at 9.3 kn until 1420.

   Give the 1420 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 1220 you fix your position 257°T, 2.9 nm from Gannet Rock daybeacon. You steer 298°T at 8.2 kn until 1230, then 212°T at 4.8 kn until 1255.

   Give the 1255 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 1520 you fix your position 076°T, 1.8 nm from Heron Point Light. You steer 313°T at 4.2 kn until 1530, then 358°T at 4.4 kn until 1545.

   Give the 1545 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  

8. At 1315 you fix your position 137°T, 1.4 nm from Gannet Rock daybeacon. You steer 261°T at 5.0 kn until 1325, then 226°T at 4.3 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