Worksheet 578 · Skill 3

Dead reckoning

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1. At 0820 you fix your position 315°T, 2.8 nm from Tern Island tower. You steer 078°T at 7.9 kn until 0840, then 113°T at 7.3 kn until 0920.

   Give the 0920 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  

2. At 0735 you fix your position 051°T, 3.9 nm from Tern Island tower. You steer 152°T at 4.1 kn until 0750, then 199°T at 6.6 kn until 0805.

   Give the 0805 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 0910 you fix your position 298°T, 1.4 nm from Gannet Rock daybeacon. You steer 097°T at 6.0 kn until 0935, then 019°T at 5.1 kn until 1005.

   Give the 1005 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  

4. At 1410 you fix your position 163°T, 1.6 nm from Tern Island tower. You steer 158°T at 5.3 kn until 1440, then 100°T at 5.2 kn until 1455.

   Give the 1455 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

5. At 1000 you fix your position 314°T, 1.3 nm from Gannet Rock daybeacon. You steer 282°T at 4.5 kn until 1040, then 177°T at 4.9 kn until 1110.

   Give the 1110 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  

6. At 1535 you fix your position 025°T, 3.0 nm from Heron Point Light. You steer 072°T at 4.3 kn until 1615, then 135°T at 6.8 kn until 1700.

   Give the 1700 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

7. At 0710 you fix your position 028°T, 3.5 nm from Heron Point Light. You steer 030°T at 4.1 kn until 0755, then 081°T at 7.7 kn until 0825.

   Give the 0825 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 1220 you fix your position 032°T, 2.3 nm from Westfield church spire. You steer 145°T at 7.9 kn until 1255, then 101°T at 6.7 kn until 1320.

   Give the 1320 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