Worksheet 451 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 200°T, 2.2 nm from Tern Island tower. You steer 266°T at 4.8 kn until 1410, then 153°T at 4.9 kn until 1420.

   Give the 1420 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  

2. At 1030 you fix your position 031°T, 3.3 nm from Heron Point Light. You steer 021°T at 5.8 kn until 1100, then 218°T at 8.7 kn until 1120.

   Give the 1120 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 1150 you fix your position 343°T, 1.5 nm from Heron Point Light. You steer 308°T at 9.3 kn until 1200, then 079°T at 4.7 kn until 1225.

   Give the 1225 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 0840 you fix your position 036°T, 2.2 nm from Heron Point Light. You steer 347°T at 5.3 kn until 0900, then 219°T at 5.7 kn until 0915.

   Give the 0915 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 1220 you fix your position 161°T, 1.5 nm from Tern Island tower. You steer 203°T at 5.4 kn until 1235, then 101°T at 6.8 kn until 1305.

   Give the 1305 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  

6. At 1535 you fix your position 220°T, 2.7 nm from Tern Island tower. You steer 062°T at 5.8 kn until 1545, then 338°T at 5.7 kn until 1555.

   Give the 1555 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 1410 you fix your position 243°T, 2.0 nm from Tern Island tower. You steer 200°T at 10.0 kn until 1425, then 046°T at 5.4 kn until 1435.

   Give the 1435 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 1415 you fix your position 095°T, 3.0 nm from Westfield church spire. You steer 237°T at 4.7 kn until 1430, then 343°T at 8.7 kn until 1455.

   Give the 1455 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