Worksheet 681 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 026°T, 1.3 nm from Heron Point Light. You steer 084°T at 6.2 kn until 1140, then 259°T at 8.2 kn until 1150.

   Give the 1150 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  

2. At 0940 you fix your position 309°T, 3.1 nm from Tern Island tower. You steer 190°T at 4.3 kn until 1015, then 107°T at 8.0 kn until 1035.

   Give the 1035 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 1515 you fix your position 318°T, 1.1 nm from Gannet Rock daybeacon. You steer 196°T at 5.9 kn until 1550, then 356°T at 5.5 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  

4. At 1120 you fix your position 015°T, 2.5 nm from Heron Point Light. You steer 352°T at 9.4 kn until 1130, then 318°T at 5.5 kn until 1200.

   Give the 1200 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  

5. At 0720 you fix your position 075°T, 1.8 nm from Westfield church spire. You steer 019°T at 4.1 kn until 0755, then 164°T at 5.4 kn until 0820.

   Give the 0820 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  

6. At 1535 you fix your position 349°T, 2.0 nm from Heron Point Light. You steer 034°T at 4.0 kn until 1615, then 083°T at 4.4 kn until 1635.

   Give the 1635 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 1405 you fix your position 346°T, 2.8 nm from Kittle water tank. You steer 097°T at 4.3 kn until 1420, then 333°T at 4.7 kn until 1445.

   Give the 1445 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 1545 you fix your position 055°T, 3.5 nm from Tern Island tower. You steer 274°T at 7.0 kn until 1610, then 088°T at 7.5 kn until 1645.

   Give the 1645 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