Worksheet 2 · Skill 3

Dead reckoning

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1. At 1520 you fix your position 000°T, 3.3 nm from Mill stack. You steer 209°T at 7.6 kn until 1540, then 090°T at 5.4 kn until 1550.

   Give the 1550 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 1425 you fix your position 338°T, 2.5 nm from Mill stack. You steer 100°T at 5.1 kn until 1440, then 255°T at 9.5 kn until 1455.

   Give the 1455 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 1025 you fix your position 220°T, 1.3 nm from Tern Island tower. You steer 157°T at 7.6 kn until 1055, then 241°T at 4.0 kn until 1110.

   Give the 1110 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  

4. At 1020 you fix your position 040°T, 3.6 nm from Westfield church spire. You steer 289°T at 8.3 kn until 1030, then 177°T at 4.4 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  

5. At 1215 you fix your position 274°T, 1.7 nm from Gannet Rock daybeacon. You steer 260°T at 8.4 kn until 1235, then 046°T at 7.0 kn until 1250.

   Give the 1250 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 1145 you fix your position 240°T, 2.2 nm from Tern Island tower. You steer 251°T at 4.3 kn until 1205, then 312°T at 9.5 kn until 1235.

   Give the 1235 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  

7. At 0720 you fix your position 021°T, 2.2 nm from Mill stack. You steer 038°T at 9.4 kn until 0750, then 222°T at 8.9 kn until 0835.

   Give the 0835 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 1000 you fix your position 146°T, 1.3 nm from Westfield church spire. You steer 125°T at 6.6 kn until 1015, then 027°T at 6.7 kn until 1100.

   Give the 1100 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