Worksheet 485 · Skill 3

Dead reckoning

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1. At 1120 you fix your position 040°T, 2.6 nm from Heron Point Light. You steer 338°T at 5.1 kn until 1200, then 108°T at 9.3 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  

2. At 1440 you fix your position 036°T, 2.8 nm from Gannet Rock daybeacon. You steer 322°T at 8.0 kn until 1500, then 135°T at 8.5 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  

3. At 0705 you fix your position 316°T, 3.0 nm from Tern Island tower. You steer 208°T at 8.5 kn until 0735, then 089°T at 9.8 kn until 0750.

   Give the 0750 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 0925 you fix your position 051°T, 2.1 nm from Heron Point Light. You steer 160°T at 8.6 kn until 0935, then 287°T at 5.5 kn until 0955.

   Give the 0955 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  

5. At 1520 you fix your position 341°T, 2.3 nm from Mill stack. You steer 088°T at 4.4 kn until 1600, then 013°T at 8.7 kn until 1615.

   Give the 1615 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 1045 you fix your position 058°T, 3.7 nm from Westfield church spire. You steer 150°T at 4.5 kn until 1055, then 311°T at 7.0 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  

7. At 1525 you fix your position 245°T, 2.2 nm from Tern Island tower. You steer 353°T at 4.1 kn until 1610, then 264°T at 4.7 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  

8. At 1550 you fix your position 007°T, 1.9 nm from Kittle water tank. You steer 338°T at 4.6 kn until 1620, then 238°T at 5.2 kn until 1645.

   Give the 1645 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