Worksheet 138 · Skill 3

Dead reckoning

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1. At 0805 you fix your position 051°T, 2.3 nm from Heron Point Light. You steer 132°T at 4.5 kn until 0845, then 300°T at 8.1 kn until 0855.

   Give the 0855 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  

2. At 1430 you fix your position 120°T, 1.9 nm from Gannet Rock daybeacon. You steer 035°T at 4.1 kn until 1510, then 353°T at 4.1 kn until 1555.

   Give the 1555 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  

3. At 0850 you fix your position 093°T, 2.3 nm from Westfield church spire. You steer 021°T at 6.5 kn until 0910, then 105°T at 8.0 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  

4. At 1600 you fix your position 271°T, 2.8 nm from Tern Island tower. You steer 146°T at 4.1 kn until 1610, then 052°T at 8.6 kn until 1630.

   Give the 1630 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 1125 you fix your position 277°T, 2.7 nm from Tern Island tower. You steer 270°T at 4.4 kn until 1200, then 109°T at 7.1 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  

6. At 1435 you fix your position 277°T, 2.2 nm from Tern Island tower. You steer 160°T at 7.6 kn until 1500, then 305°T at 4.7 kn until 1515.

   Give the 1515 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  

7. At 0750 you fix your position 046°T, 4.0 nm from Westfield church spire. You steer 205°T at 4.9 kn until 0830, then 057°T at 4.4 kn until 0850.

   Give the 0850 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  

8. At 0935 you fix your position 239°T, 2.6 nm from Tern Island tower. You steer 291°T at 5.7 kn until 0955, then 076°T at 8.8 kn until 1010.

   Give the 1010 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