Worksheet 126 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 005°T, 1.8 nm from Tern Island tower. You steer 261°T at 5.1 kn until 1130, then 229°T at 5.5 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 1010 you fix your position 019°T, 2.9 nm from Westfield church spire. You steer 130°T at 5.8 kn until 1020, then 180°T at 7.3 kn until 1100.

   Give the 1100 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 0745 you fix your position 051°T, 2.9 nm from Westfield church spire. You steer 196°T at 4.5 kn until 0805, then 067°T at 4.8 kn until 0815.

   Give the 0815 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 1140 you fix your position 042°T, 4.1 nm from Westfield church spire. You steer 231°T at 6.5 kn until 1155, then 123°T at 10.0 kn until 1210.

   Give the 1210 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 0910 you fix your position 288°T, 3.2 nm from Tern Island tower. You steer 173°T at 7.8 kn until 0940, then 269°T at 7.7 kn until 0950.

   Give the 0950 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  

6. At 0750 you fix your position 251°T, 2.1 nm from Tern Island tower. You steer 219°T at 5.6 kn until 0805, then 160°T at 4.8 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  

7. At 1540 you fix your position 099°T, 2.1 nm from Westfield church spire. You steer 351°T at 7.1 kn until 1600, then 181°T at 7.6 kn until 1620.

   Give the 1620 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 1005 you fix your position 027°T, 2.7 nm from Gannet Rock daybeacon. You steer 235°T at 6.7 kn until 1030, then 176°T at 4.4 kn until 1115.

   Give the 1115 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