Worksheet 171 · Skill 3

Dead reckoning

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1. At 1345 you fix your position 236°T, 2.6 nm from Tern Island tower. You steer 320°T at 5.2 kn until 1415, then 204°T at 7.1 kn until 1445.

   Give the 1445 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 1030 you fix your position 321°T, 2.4 nm from Tern Island tower. You steer 208°T at 5.6 kn until 1110, then 359°T at 5.0 kn until 1135.

   Give the 1135 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 1320 you fix your position 063°T, 1.7 nm from Gannet Rock daybeacon. You steer 258°T at 6.8 kn until 1400, then 056°T at 6.4 kn until 1435.

   Give the 1435 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 1150 you fix your position 308°T, 3.8 nm from Tern Island tower. You steer 222°T at 4.4 kn until 1230, then 340°T at 6.0 kn until 1250.

   Give the 1250 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 1105 you fix your position 205°T, 2.9 nm from Tern Island tower. You steer 037°T at 9.1 kn until 1115, then 173°T at 6.4 kn until 1130.

   Give the 1130 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 0820 you fix your position 110°T, 1.5 nm from Gannet Rock daybeacon. You steer 037°T at 9.7 kn until 0830, then 344°T at 5.8 kn until 0840.

   Give the 0840 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  

7. At 0800 you fix your position 107°T, 1.1 nm from Westfield church spire. You steer 125°T at 7.9 kn until 0845, then 038°T at 4.5 kn until 0900.

   Give the 0900 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

8. At 1425 you fix your position 015°T, 1.0 nm from Heron Point Light. You steer 047°T at 4.5 kn until 1440, then 129°T at 4.2 kn until 1500.

   Give the 1500 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