Worksheet 458 · Skill 3

Dead reckoning

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1. At 1330 you fix your position 253°T, 3.6 nm from Tern Island tower. You steer 140°T at 5.4 kn until 1415, then 343°T at 6.6 kn until 1455.

   Give the 1455 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 0940 you fix your position 271°T, 2.0 nm from Gannet Rock daybeacon. You steer 061°T at 4.8 kn until 0955, then 238°T at 5.1 kn until 1025.

   Give the 1025 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 1130 you fix your position 292°T, 2.9 nm from Tern Island tower. You steer 195°T at 5.8 kn until 1155, then 044°T at 8.2 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  

4. At 0725 you fix your position 054°T, 2.6 nm from Westfield church spire. You steer 048°T at 8.1 kn until 0745, then 126°T at 6.9 kn until 0755.

   Give the 0755 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 1150 you fix your position 224°T, 3.3 nm from Tern Island tower. You steer 082°T at 7.1 kn until 1230, then 255°T at 4.3 kn until 1245.

   Give the 1245 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 1505 you fix your position 273°T, 1.5 nm from Tern Island tower. You steer 214°T at 6.4 kn until 1550, then 349°T at 7.7 kn until 1630.

   Give the 1630 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 1010 you fix your position 114°T, 1.3 nm from Westfield church spire. You steer 219°T at 7.4 kn until 1020, then 080°T at 9.1 kn until 1045.

   Give the 1045 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  

8. At 1410 you fix your position 053°T, 3.8 nm from Westfield church spire. You steer 044°T at 4.2 kn until 1430, then 179°T at 9.6 kn until 1505.

   Give the 1505 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