Worksheet 315 · Skill 3

Dead reckoning

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1. At 1425 you fix your position 041°T, 1.3 nm from Kittle water tank. You steer 001°T at 9.3 kn until 1445, then 279°T at 4.6 kn until 1455.

   Give the 1455 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 1600 you fix your position 009°T, 3.3 nm from Westfield church spire. You steer 152°T at 4.2 kn until 1635, then 082°T at 6.1 kn until 1710.

   Give the 1710 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 258°T, 3.2 nm from Tern Island tower. You steer 194°T at 5.7 kn until 1400, then 007°T at 5.5 kn until 1415.

   Give the 1415 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  

4. At 1530 you fix your position 047°T, 4.0 nm from Westfield church spire. You steer 158°T at 8.8 kn until 1550, then 122°T at 10.0 kn until 1615.

   Give the 1615 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 0840 you fix your position 039°T, 4.4 nm from Gannet Rock daybeacon. You steer 179°T at 10.0 kn until 0915, then 342°T at 8.2 kn until 0945.

   Give the 0945 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 0920 you fix your position 135°T, 1.8 nm from Westfield church spire. You steer 052°T at 6.4 kn until 0940, then 134°T at 5.7 kn until 1015.

   Give the 1015 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  

7. At 1315 you fix your position 105°T, 1.1 nm from Westfield church spire. You steer 038°T at 6.0 kn until 1340, then 198°T at 9.6 kn until 1400.

   Give the 1400 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 0910 you fix your position 020°T, 3.1 nm from Westfield church spire. You steer 145°T at 8.7 kn until 0940, then 085°T at 5.9 kn until 1000.

   Give the 1000 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