Worksheet 320 · Skill 3

Dead reckoning

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1. At 1140 you fix your position 238°T, 2.3 nm from Tern Island tower. You steer 135°T at 4.0 kn until 1225, then 225°T at 8.1 kn until 1245.

   Give the 1245 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 0805 you fix your position 343°T, 1.7 nm from Mill stack. You steer 241°T at 4.0 kn until 0820, then 092°T at 5.4 kn until 0835.

   Give the 0835 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 0815 you fix your position 272°T, 2.1 nm from Tern Island tower. You steer 032°T at 7.6 kn until 0825, then 082°T at 9.0 kn until 0835.

   Give the 0835 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 1445 you fix your position 077°T, 3.4 nm from Tern Island tower. You steer 213°T at 9.3 kn until 1515, then 086°T at 6.7 kn until 1530.

   Give the 1530 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  

5. At 1030 you fix your position 020°T, 1.3 nm from Tern Island tower. You steer 017°T at 4.8 kn until 1045, then 245°T at 8.4 kn until 1125.

   Give the 1125 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  

6. At 0740 you fix your position 236°T, 2.6 nm from Tern Island tower. You steer 335°T at 7.4 kn until 0805, then 263°T at 9.1 kn until 0820.

   Give the 0820 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  

7. At 0705 you fix your position 053°T, 1.2 nm from Westfield church spire. You steer 146°T at 7.0 kn until 0745, then 334°T at 7.5 kn until 0830.

   Give the 0830 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 1040 you fix your position 065°T, 2.5 nm from Gannet Rock daybeacon. You steer 234°T at 4.3 kn until 1100, then 311°T at 4.1 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