Worksheet 130 · Skill 3

Dead reckoning

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1. At 1115 you fix your position 254°T, 2.1 nm from Gannet Rock daybeacon. You steer 216°T at 7.5 kn until 1135, then 059°T at 8.3 kn until 1145.

   Give the 1145 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  

2. At 1140 you fix your position 036°T, 4.1 nm from Gannet Rock daybeacon. You steer 170°T at 8.0 kn until 1215, then 279°T at 9.7 kn until 1300.

   Give the 1300 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 0935 you fix your position 064°T, 2.3 nm from Westfield church spire. You steer 070°T at 9.4 kn until 0945, then 139°T at 6.5 kn until 0955.

   Give the 0955 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  

4. At 0745 you fix your position 091°T, 1.9 nm from Westfield church spire. You steer 307°T at 7.7 kn until 0755, then 057°T at 6.9 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  

5. At 1455 you fix your position 005°T, 1.0 nm from Gannet Rock daybeacon. You steer 350°T at 4.8 kn until 1540, then 194°T at 4.3 kn until 1550.

   Give the 1550 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 1450 you fix your position 081°T, 3.3 nm from Westfield church spire. You steer 084°T at 4.4 kn until 1510, then 043°T at 8.6 kn until 1535.

   Give the 1535 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 1315 you fix your position 052°T, 2.1 nm from Gannet Rock daybeacon. You steer 280°T at 4.1 kn until 1325, then 332°T at 9.5 kn until 1345.

   Give the 1345 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  

8. At 0815 you fix your position 035°T, 2.1 nm from Mill stack. You steer 289°T at 9.2 kn until 0840, then 341°T at 5.9 kn until 0915.

   Give the 0915 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