Worksheet 524 · Skill 3

Dead reckoning

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1. At 1545 you fix your position 217°T, 3.2 nm from Tern Island tower. You steer 046°T at 5.2 kn until 1610, then 087°T at 4.6 kn until 1625.

   Give the 1625 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 0845 you fix your position 260°T, 2.9 nm from Gannet Rock daybeacon. You steer 112°T at 5.4 kn until 0855, then 185°T at 4.0 kn until 0915.

   Give the 0915 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 1430 you fix your position 029°T, 3.7 nm from Heron Point Light. You steer 101°T at 7.0 kn until 1450, then 281°T at 4.9 kn until 1535.

   Give the 1535 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 1040 you fix your position 095°T, 2.0 nm from Heron Point Light. You steer 344°T at 4.1 kn until 1125, then 056°T at 7.5 kn until 1145.

   Give the 1145 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 1305 you fix your position 022°T, 2.2 nm from Mill stack. You steer 349°T at 8.3 kn until 1320, then 066°T at 6.5 kn until 1405.

   Give the 1405 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  

6. At 1135 you fix your position 254°T, 1.8 nm from Gannet Rock daybeacon. You steer 005°T at 4.4 kn until 1200, then 249°T at 4.2 kn until 1210.

   Give the 1210 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 1205 you fix your position 055°T, 3.5 nm from Heron Point Light. You steer 024°T at 6.1 kn until 1215, then 348°T at 6.2 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  

8. At 1315 you fix your position 096°T, 3.0 nm from Gannet Rock daybeacon. You steer 337°T at 7.2 kn until 1330, then 239°T at 4.9 kn until 1345.

   Give the 1345 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