Worksheet 748 · Skill 3

Dead reckoning

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1. At 0910 you fix your position 358°T, 2.0 nm from Heron Point Light. You steer 122°T at 7.0 kn until 0920, then 008°T at 7.7 kn until 0935.

   Give the 0935 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 1325 you fix your position 280°T, 3.6 nm from Tern Island tower. You steer 170°T at 5.1 kn until 1350, then 327°T at 4.6 kn until 1430.

   Give the 1430 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  

3. At 0820 you fix your position 013°T, 3.0 nm from Mill stack. You steer 269°T at 5.3 kn until 0830, then 332°T at 8.8 kn until 0905.

   Give the 0905 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  

4. At 1330 you fix your position 337°T, 2.8 nm from Kittle water tank. You steer 073°T at 5.4 kn until 1350, then 209°T at 4.5 kn until 1425.

   Give the 1425 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

5. At 1150 you fix your position 211°T, 2.2 nm from Tern Island tower. You steer 263°T at 4.7 kn until 1225, then 166°T at 5.5 kn until 1255.

   Give the 1255 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  

6. At 0840 you fix your position 057°T, 1.8 nm from Westfield church spire. You steer 065°T at 5.6 kn until 0915, then 264°T at 4.1 kn until 0940.

   Give the 0940 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 0935 you fix your position 200°T, 2.4 nm from Tern Island tower. You steer 061°T at 6.0 kn until 1005, then 008°T at 4.4 kn until 1015.

   Give the 1015 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 1225 you fix your position 239°T, 2.3 nm from Tern Island tower. You steer 256°T at 9.0 kn until 1245, then 357°T at 6.4 kn until 1255.

   Give the 1255 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