Worksheet 497 · Skill 3

Dead reckoning

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1. At 1220 you fix your position 038°T, 2.7 nm from Tern Island tower. You steer 259°T at 9.9 kn until 1305, then 078°T at 8.1 kn until 1335.

   Give the 1335 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 0935 you fix your position 309°T, 1.5 nm from Gannet Rock daybeacon. You steer 178°T at 5.6 kn until 1005, then 064°T at 4.6 kn until 1045.

   Give the 1045 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 1015 you fix your position 089°T, 1.2 nm from Heron Point Light. You steer 070°T at 7.7 kn until 1045, then 249°T at 6.5 kn until 1115.

   Give the 1115 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  

4. At 1155 you fix your position 052°T, 3.4 nm from Heron Point Light. You steer 136°T at 6.0 kn until 1230, then 336°T at 4.1 kn until 1245.

   Give the 1245 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  

5. At 1320 you fix your position 010°T, 2.5 nm from Tern Island tower. You steer 253°T at 5.9 kn until 1350, then 071°T at 4.9 kn until 1410.

   Give the 1410 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  

6. At 1040 you fix your position 038°T, 3.8 nm from Gannet Rock daybeacon. You steer 256°T at 5.7 kn until 1100, then 210°T at 6.8 kn until 1130.

   Give the 1130 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 1150 you fix your position 073°T, 1.9 nm from Westfield church spire. You steer 343°T at 4.3 kn until 1200, then 106°T at 8.4 kn until 1225.

   Give the 1225 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 0815 you fix your position 320°T, 2.2 nm from Tern Island tower. You steer 208°T at 8.7 kn until 0850, then 265°T at 6.2 kn until 0900.

   Give the 0900 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