Worksheet 541 · Skill 3

Dead reckoning

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1. At 0810 you fix your position 040°T, 3.9 nm from Gannet Rock daybeacon. You steer 156°T at 4.1 kn until 0835, then 330°T at 9.5 kn until 0900.

   Give the 0900 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 0715 you fix your position 333°T, 1.3 nm from Kittle water tank. You steer 001°T at 9.7 kn until 0740, then 215°T at 4.5 kn until 0755.

   Give the 0755 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 1430 you fix your position 096°T, 3.3 nm from Westfield church spire. You steer 046°T at 9.5 kn until 1445, then 136°T at 9.8 kn until 1525.

   Give the 1525 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  

4. At 1020 you fix your position 103°T, 2.2 nm from Gannet Rock daybeacon. You steer 224°T at 7.8 kn until 1030, then 015°T at 9.8 kn until 1040.

   Give the 1040 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 0840 you fix your position 079°T, 2.2 nm from Gannet Rock daybeacon. You steer 247°T at 8.5 kn until 0920, then 358°T at 7.7 kn until 0950.

   Give the 0950 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 1040 you fix your position 253°T, 1.9 nm from Tern Island tower. You steer 172°T at 5.9 kn until 1115, then 222°T at 5.7 kn until 1125.

   Give the 1125 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  

7. At 1000 you fix your position 277°T, 1.9 nm from Gannet Rock daybeacon. You steer 163°T at 4.8 kn until 1030, then 078°T at 6.8 kn until 1100.

   Give the 1100 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  

8. At 1525 you fix your position 113°T, 1.7 nm from Tern Island tower. You steer 358°T at 4.2 kn until 1535, then 152°T at 7.6 kn until 1550.

   Give the 1550 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