Worksheet 412 · Skill 3

Dead reckoning

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1. At 1540 you fix your position 298°T, 3.0 nm from Tern Island tower. You steer 047°T at 7.1 kn until 1550, then 218°T at 6.3 kn until 1625.

   Give the 1625 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 1430 you fix your position 046°T, 1.5 nm from Heron Point Light. You steer 264°T at 4.2 kn until 1440, then 107°T at 8.6 kn until 1455.

   Give the 1455 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  

3. At 0855 you fix your position 335°T, 1.1 nm from Heron Point Light. You steer 095°T at 8.5 kn until 0930, then 042°T at 5.9 kn until 1005.

   Give the 1005 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 1305 you fix your position 053°T, 3.5 nm from Westfield church spire. You steer 127°T at 4.8 kn until 1345, then 352°T at 7.9 kn until 1400.

   Give the 1400 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 0755 you fix your position 236°T, 1.9 nm from Tern Island tower. You steer 145°T at 9.8 kn until 0815, then 280°T at 5.3 kn until 0855.

   Give the 0855 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  

6. At 0835 you fix your position 288°T, 2.5 nm from Tern Island tower. You steer 248°T at 6.9 kn until 0855, then 282°T at 7.4 kn until 0910.

   Give the 0910 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 1220 you fix your position 345°T, 1.8 nm from Mill stack. You steer 091°T at 5.2 kn until 1235, then 350°T at 9.7 kn until 1255.

   Give the 1255 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 1220 you fix your position 070°T, 2.8 nm from Heron Point Light. You steer 357°T at 6.7 kn until 1255, then 030°T at 9.5 kn until 1305.

   Give the 1305 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