Worksheet 74 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 067°T, 2.7 nm from Heron Point Light. You steer 006°T at 7.1 kn until 1150, then 155°T at 6.5 kn until 1200.

   Give the 1200 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  

2. At 1240 you fix your position 207°T, 0.9 nm from Gannet Rock daybeacon. You steer 303°T at 7.2 kn until 1305, then 190°T at 5.2 kn until 1315.

   Give the 1315 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 1410 you fix your position 238°T, 3.3 nm from Tern Island tower. You steer 022°T at 6.0 kn until 1435, then 155°T at 4.5 kn until 1445.

   Give the 1445 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 1025 you fix your position 059°T, 2.9 nm from Heron Point Light. You steer 356°T at 8.3 kn until 1100, then 280°T at 4.5 kn until 1135.

   Give the 1135 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 0715 you fix your position 058°T, 2.8 nm from Gannet Rock daybeacon. You steer 325°T at 9.2 kn until 0730, then 213°T at 7.7 kn until 0750.

   Give the 0750 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 1425 you fix your position 298°T, 4.4 nm from Tern Island tower. You steer 103°T at 7.3 kn until 1445, then 173°T at 9.3 kn until 1455.

   Give the 1455 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 1030 you fix your position 359°T, 2.6 nm from Mill stack. You steer 352°T at 9.3 kn until 1055, then 296°T at 9.1 kn until 1115.

   Give the 1115 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  

8. At 0735 you fix your position 043°T, 2.6 nm from Tern Island tower. You steer 173°T at 6.1 kn until 0750, then 300°T at 5.3 kn until 0810.

   Give the 0810 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