Worksheet 628 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 045°T, 2.7 nm from Heron Point Light. You steer 303°T at 9.4 kn until 0830, then 122°T at 8.8 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  

2. At 1500 you fix your position 076°T, 2.4 nm from Westfield church spire. You steer 144°T at 4.2 kn until 1540, then 334°T at 9.1 kn until 1615.

   Give the 1615 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 0740 you fix your position 280°T, 3.8 nm from Tern Island tower. You steer 191°T at 9.8 kn until 0755, then 079°T at 4.6 kn until 0840.

   Give the 0840 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 1255 you fix your position 127°T, 1.3 nm from Westfield church spire. You steer 033°T at 7.7 kn until 1320, then 198°T at 5.0 kn until 1330.

   Give the 1330 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 1030 you fix your position 303°T, 3.7 nm from Tern Island tower. You steer 205°T at 6.9 kn until 1105, then 053°T at 6.8 kn until 1120.

   Give the 1120 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 1155 you fix your position 026°T, 3.4 nm from Westfield church spire. You steer 115°T at 4.1 kn until 1215, then 063°T at 6.0 kn until 1230.

   Give the 1230 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 1455 you fix your position 065°T, 2.2 nm from Gannet Rock daybeacon. You steer 127°T at 7.6 kn until 1505, then 264°T at 5.1 kn until 1535.

   Give the 1535 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  

8. At 0850 you fix your position 282°T, 2.9 nm from Tern Island tower. You steer 229°T at 6.4 kn until 0915, then 002°T at 4.2 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