Worksheet 188 · Skill 3

Dead reckoning

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1. At 1235 you fix your position 067°T, 3.3 nm from Westfield church spire. You steer 067°T at 4.6 kn until 1320, then 227°T at 9.7 kn until 1345.

   Give the 1345 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 1215 you fix your position 252°T, 1.8 nm from Tern Island tower. You steer 291°T at 8.4 kn until 1230, then 161°T at 6.3 kn until 1250.

   Give the 1250 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 0710 you fix your position 287°T, 1.9 nm from Tern Island tower. You steer 157°T at 4.8 kn until 0725, then 016°T at 4.9 kn until 0805.

   Give the 0805 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 1500 you fix your position 321°T, 1.3 nm from Gannet Rock daybeacon. You steer 266°T at 7.2 kn until 1545, then 055°T at 9.6 kn until 1610.

   Give the 1610 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 1050 you fix your position 311°T, 2.6 nm from Tern Island tower. You steer 076°T at 8.8 kn until 1100, then 219°T at 5.4 kn until 1115.

   Give the 1115 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 0850 you fix your position 098°T, 3.2 nm from Westfield church spire. You steer 026°T at 7.9 kn until 0900, then 078°T at 4.6 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  

7. At 0710 you fix your position 257°T, 3.0 nm from Gannet Rock daybeacon. You steer 275°T at 9.8 kn until 0730, then 168°T at 9.2 kn until 0740.

   Give the 0740 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  

8. At 1500 you fix your position 019°T, 2.9 nm from Heron Point Light. You steer 323°T at 5.1 kn until 1515, then 105°T at 8.5 kn until 1555.

   Give the 1555 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