Worksheet 70 · Skill 3

Dead reckoning

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1. At 1135 you fix your position 063°T, 3.5 nm from Tern Island tower. You steer 202°T at 6.0 kn until 1150, then 131°T at 4.9 kn until 1230.

   Give the 1230 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  

2. At 1220 you fix your position 299°T, 2.3 nm from Tern Island tower. You steer 266°T at 7.7 kn until 1250, then 314°T at 4.1 kn until 1315.

   Give the 1315 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 1520 you fix your position 259°T, 3.4 nm from Tern Island tower. You steer 147°T at 8.4 kn until 1545, then 099°T at 7.4 kn until 1620.

   Give the 1620 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  

4. At 1445 you fix your position 054°T, 2.5 nm from Heron Point Light. You steer 110°T at 6.4 kn until 1530, then 041°T at 6.0 kn until 1545.

   Give the 1545 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 1505 you fix your position 046°T, 1.8 nm from Westfield church spire. You steer 067°T at 4.5 kn until 1520, then 117°T at 6.2 kn until 1545.

   Give the 1545 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 1420 you fix your position 014°T, 2.0 nm from Heron Point Light. You steer 337°T at 4.4 kn until 1500, then 074°T at 7.2 kn until 1510.

   Give the 1510 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  

7. At 0845 you fix your position 083°T, 3.2 nm from Tern Island tower. You steer 040°T at 5.1 kn until 0900, then 166°T at 7.5 kn until 0930.

   Give the 0930 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 1035 you fix your position 039°T, 2.0 nm from Tern Island tower. You steer 258°T at 9.8 kn until 1110, then 010°T at 6.5 kn until 1120.

   Give the 1120 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