Worksheet 357 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 293°T, 3.8 nm from Tern Island tower. You steer 269°T at 6.1 kn until 1600, then 229°T at 9.4 kn until 1610.

   Give the 1610 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  

2. At 1200 you fix your position 049°T, 3.3 nm from Westfield church spire. You steer 202°T at 4.4 kn until 1210, then 354°T at 4.7 kn until 1230.

   Give the 1230 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 1335 you fix your position 124°T, 1.3 nm from Gannet Rock daybeacon. You steer 005°T at 7.7 kn until 1350, then 253°T at 8.3 kn until 1415.

   Give the 1415 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  

4. At 1135 you fix your position 170°T, 1.4 nm from Tern Island tower. You steer 221°T at 4.7 kn until 1155, then 161°T at 4.8 kn until 1205.

   Give the 1205 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  

5. At 1500 you fix your position 328°T, 1.6 nm from Tern Island tower. You steer 271°T at 7.4 kn until 1530, then 180°T at 6.7 kn until 1545.

   Give the 1545 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 1515 you fix your position 015°T, 2.4 nm from Westfield church spire. You steer 177°T at 8.2 kn until 1525, then 066°T at 7.0 kn until 1545.

   Give the 1545 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 1350 you fix your position 206°T, 2.8 nm from Tern Island tower. You steer 296°T at 4.3 kn until 1415, then 264°T at 7.7 kn until 1425.

   Give the 1425 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 1125 you fix your position 031°T, 2.6 nm from Mill stack. You steer 029°T at 4.2 kn until 1135, then 081°T at 7.4 kn until 1210.

   Give the 1210 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