Worksheet 163 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 018°T, 2.1 nm from Heron Point Light. You steer 152°T at 4.5 kn until 1410, then 335°T at 8.5 kn until 1440.

   Give the 1440 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  

2. At 0720 you fix your position 260°T, 3.0 nm from Tern Island tower. You steer 146°T at 8.0 kn until 0800, then 263°T at 5.5 kn until 0825.

   Give the 0825 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  

3. At 0755 you fix your position 030°T, 2.8 nm from Westfield church spire. You steer 171°T at 6.6 kn until 0840, then 141°T at 7.6 kn until 0850.

   Give the 0850 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 1550 you fix your position 067°T, 2.5 nm from Heron Point Light. You steer 142°T at 9.8 kn until 1600, then 032°T at 6.6 kn until 1630.

   Give the 1630 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 0750 you fix your position 110°T, 2.3 nm from Westfield church spire. You steer 016°T at 9.5 kn until 0815, then 298°T at 6.8 kn until 0825.

   Give the 0825 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 1035 you fix your position 054°T, 3.5 nm from Westfield church spire. You steer 111°T at 5.5 kn until 1050, then 060°T at 5.2 kn until 1130.

   Give the 1130 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 0745 you fix your position 321°T, 2.3 nm from Tern Island tower. You steer 250°T at 6.2 kn until 0800, then 183°T at 6.3 kn until 0825.

   Give the 0825 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 1240 you fix your position 211°T, 1.5 nm from Gannet Rock daybeacon. You steer 327°T at 9.2 kn until 1255, then 220°T at 6.8 kn until 1325.

   Give the 1325 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