Worksheet 81 · Skill 3

Dead reckoning

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1. At 0715 you fix your position 181°T, 1.6 nm from Tern Island tower. You steer 274°T at 9.6 kn until 0735, then 105°T at 8.4 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  

2. At 0955 you fix your position 035°T, 2.4 nm from Heron Point Light. You steer 216°T at 5.3 kn until 1010, then 351°T at 4.1 kn until 1055.

   Give the 1055 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 0825 you fix your position 049°T, 2.4 nm from Mill stack. You steer 284°T at 6.6 kn until 0850, then 091°T at 4.9 kn until 0910.

   Give the 0910 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  

4. At 1320 you fix your position 001°T, 2.2 nm from Tern Island tower. You steer 113°T at 8.5 kn until 1330, then 079°T at 6.0 kn until 1405.

   Give the 1405 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 009°T, 2.0 nm from Heron Point Light. You steer 356°T at 6.4 kn until 1420, then 171°T at 5.8 kn until 1445.

   Give the 1445 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 1050 you fix your position 239°T, 2.2 nm from Gannet Rock daybeacon. You steer 272°T at 9.0 kn until 1125, then 088°T at 8.2 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  

7. At 1145 you fix your position 041°T, 2.6 nm from Gannet Rock daybeacon. You steer 184°T at 7.0 kn until 1215, then 357°T at 6.1 kn until 1235.

   Give the 1235 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 1445 you fix your position 090°T, 3.2 nm from Westfield church spire. You steer 102°T at 9.6 kn until 1520, then 237°T at 7.6 kn until 1555.

   Give the 1555 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