Worksheet 225 · Skill 3

Dead reckoning

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1. At 1315 you fix your position 348°T, 2.2 nm from Tern Island tower. You steer 210°T at 7.6 kn until 1330, then 285°T at 8.4 kn until 1405.

   Give the 1405 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 1220 you fix your position 094°T, 2.2 nm from Westfield church spire. You steer 023°T at 9.0 kn until 1235, then 182°T at 4.0 kn until 1320.

   Give the 1320 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  

3. At 0735 you fix your position 004°T, 1.1 nm from Heron Point Light. You steer 053°T at 4.6 kn until 0750, then 331°T at 9.1 kn until 0810.

   Give the 0810 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 1555 you fix your position 071°T, 2.1 nm from Westfield church spire. You steer 253°T at 4.7 kn until 1610, then 085°T at 5.7 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  

5. At 0710 you fix your position 063°T, 2.3 nm from Gannet Rock daybeacon. You steer 271°T at 8.0 kn until 0750, then 117°T at 5.7 kn until 0825.

   Give the 0825 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  

6. At 0815 you fix your position 069°T, 2.1 nm from Westfield church spire. You steer 153°T at 7.8 kn until 0840, then 046°T at 4.9 kn until 0905.

   Give the 0905 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 1145 you fix your position 014°T, 1.4 nm from Gannet Rock daybeacon. You steer 226°T at 6.8 kn until 1215, then 291°T at 7.8 kn until 1230.

   Give the 1230 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  

8. At 1555 you fix your position 044°T, 1.4 nm from Westfield church spire. You steer 125°T at 9.7 kn until 1615, then 164°T at 7.1 kn until 1635.

   Give the 1635 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