Worksheet 585 · Skill 3

Dead reckoning

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1. At 1140 you fix your position 294°T, 1.6 nm from Gannet Rock daybeacon. You steer 215°T at 7.1 kn until 1215, then 004°T at 5.7 kn until 1240.

   Give the 1240 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  

2. At 0710 you fix your position 211°T, 2.4 nm from Tern Island tower. You steer 069°T at 7.8 kn until 0755, then 159°T at 4.7 kn until 0825.

   Give the 0825 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  

3. At 0725 you fix your position 084°T, 2.3 nm from Westfield church spire. You steer 084°T at 9.4 kn until 0735, then 341°T at 4.2 kn until 0745.

   Give the 0745 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 0900 you fix your position 054°T, 3.2 nm from Heron Point Light. You steer 072°T at 7.1 kn until 0910, then 333°T at 9.3 kn until 0945.

   Give the 0945 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 1350 you fix your position 275°T, 2.1 nm from Tern Island tower. You steer 063°T at 6.3 kn until 1425, then 163°T at 8.5 kn until 1510.

   Give the 1510 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 1100 you fix your position 312°T, 3.8 nm from Tern Island tower. You steer 209°T at 8.4 kn until 1115, then 341°T at 4.0 kn until 1140.

   Give the 1140 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 1155 you fix your position 051°T, 3.5 nm from Westfield church spire. You steer 235°T at 5.9 kn until 1215, then 182°T at 7.1 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  

8. At 1040 you fix your position 257°T, 2.5 nm from Gannet Rock daybeacon. You steer 326°T at 4.2 kn until 1105, then 192°T at 9.4 kn until 1125.

   Give the 1125 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