Worksheet 673 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 347°T, 1.1 nm from Heron Point Light. You steer 084°T at 9.8 kn until 1315, then 228°T at 5.9 kn until 1345.

   Give the 1345 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 1100 you fix your position 359°T, 2.0 nm from Heron Point Light. You steer 161°T at 4.3 kn until 1120, then 095°T at 7.7 kn until 1130.

   Give the 1130 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  

3. At 1535 you fix your position 260°T, 3.0 nm from Tern Island tower. You steer 135°T at 7.2 kn until 1620, then 019°T at 6.4 kn until 1630.

   Give the 1630 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 1130 you fix your position 025°T, 3.0 nm from Heron Point Light. You steer 065°T at 7.7 kn until 1155, then 216°T at 4.0 kn until 1220.

   Give the 1220 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  

5. At 0950 you fix your position 027°T, 4.0 nm from Westfield church spire. You steer 194°T at 4.8 kn until 1030, then 040°T at 5.0 kn until 1110.

   Give the 1110 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 0800 you fix your position 092°T, 1.9 nm from Westfield church spire. You steer 309°T at 9.0 kn until 0815, then 086°T at 9.4 kn until 0850.

   Give the 0850 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 1445 you fix your position 323°T, 1.6 nm from Tern Island tower. You steer 208°T at 7.3 kn until 1510, then 130°T at 4.7 kn until 1540.

   Give the 1540 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 1045 you fix your position 055°T, 3.8 nm from Westfield church spire. You steer 056°T at 8.7 kn until 1100, then 205°T at 6.5 kn until 1125.

   Give the 1125 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