Worksheet 270 · Skill 3

Dead reckoning

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1. At 0735 you fix your position 111°T, 2.3 nm from Westfield church spire. You steer 170°T at 7.8 kn until 0745, then 285°T at 6.3 kn until 0755.

   Give the 0755 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 1555 you fix your position 066°T, 2.6 nm from Gannet Rock daybeacon. You steer 233°T at 9.6 kn until 1635, then 019°T at 7.1 kn until 1645.

   Give the 1645 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 0945 you fix your position 345°T, 1.8 nm from Heron Point Light. You steer 139°T at 4.0 kn until 1000, then 049°T at 6.0 kn until 1040.

   Give the 1040 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 1015 you fix your position 049°T, 3.5 nm from Heron Point Light. You steer 046°T at 4.4 kn until 1035, then 179°T at 5.6 kn until 1045.

   Give the 1045 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 1340 you fix your position 204°T, 2.9 nm from Tern Island tower. You steer 189°T at 6.6 kn until 1355, then 325°T at 9.2 kn until 1435.

   Give the 1435 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 1335 you fix your position 060°T, 2.6 nm from Heron Point Light. You steer 238°T at 5.5 kn until 1345, then 017°T at 7.2 kn until 1410.

   Give the 1410 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 1420 you fix your position 008°T, 1.4 nm from Kittle water tank. You steer 016°T at 8.6 kn until 1430, then 222°T at 4.9 kn until 1445.

   Give the 1445 DR position as the true bearing FROM Gannet Rock daybeacon 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 Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

8. At 1500 you fix your position 278°T, 3.3 nm from Tern Island tower. You steer 278°T at 4.1 kn until 1515, then 155°T at 9.6 kn until 1540.

   Give the 1540 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