Worksheet 433 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 197°T, 2.3 nm from Tern Island tower. You steer 216°T at 5.4 kn until 1050, then 325°T at 7.3 kn until 1110.

   Give the 1110 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 1205 you fix your position 016°T, 1.4 nm from Westfield church spire. You steer 028°T at 4.0 kn until 1240, then 188°T at 9.0 kn until 1250.

   Give the 1250 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 0810 you fix your position 063°T, 3.7 nm from Tern Island tower. You steer 041°T at 4.8 kn until 0825, then 265°T at 8.8 kn until 0845.

   Give the 0845 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 1140 you fix your position 297°T, 4.5 nm from Tern Island tower. You steer 208°T at 9.9 kn until 1210, then 092°T at 7.9 kn until 1230.

   Give the 1230 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  

5. At 0730 you fix your position 012°T, 1.8 nm from Mill stack. You steer 352°T at 8.0 kn until 0805, then 166°T at 4.9 kn until 0825.

   Give the 0825 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 325°T, 1.5 nm from Kittle water tank. You steer 274°T at 7.4 kn until 1100, then 085°T at 7.9 kn until 1120.

   Give the 1120 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 1105 you fix your position 040°T, 2.6 nm from Heron Point Light. You steer 132°T at 8.3 kn until 1130, then 058°T at 5.3 kn until 1205.

   Give the 1205 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  

8. At 0845 you fix your position 281°T, 2.4 nm from Tern Island tower. You steer 185°T at 5.0 kn until 0910, then 034°T at 6.4 kn until 0920.

   Give the 0920 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