Worksheet 190 · Skill 3

Dead reckoning

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1. At 0915 you fix your position 343°T, 1.5 nm from Tern Island tower. You steer 236°T at 6.8 kn until 0925, then 179°T at 4.0 kn until 0955.

   Give the 0955 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 1300 you fix your position 049°T, 2.3 nm from Heron Point Light. You steer 344°T at 5.6 kn until 1310, then 216°T at 9.7 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 0955 you fix your position 095°T, 1.7 nm from Heron Point Light. You steer 073°T at 6.2 kn until 1020, then 326°T at 7.7 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  

4. At 1230 you fix your position 315°T, 2.5 nm from Tern Island tower. You steer 170°T at 6.8 kn until 1250, then 003°T at 4.0 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  

5. At 1400 you fix your position 033°T, 2.1 nm from Gannet Rock daybeacon. You steer 194°T at 5.3 kn until 1420, then 148°T at 5.7 kn until 1450.

   Give the 1450 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 0810 you fix your position 038°T, 2.2 nm from Kittle water tank. You steer 326°T at 6.7 kn until 0855, then 096°T at 9.5 kn until 0910.

   Give the 0910 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 0840 you fix your position 032°T, 3.6 nm from Heron Point Light. You steer 080°T at 5.4 kn until 0855, then 009°T at 7.6 kn until 0910.

   Give the 0910 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 1225 you fix your position 115°T, 2.0 nm from Westfield church spire. You steer 202°T at 4.9 kn until 1240, then 029°T at 6.4 kn until 1255.

   Give the 1255 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