Worksheet 363 · Skill 3

Dead reckoning

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1. At 1035 you fix your position 267°T, 0.9 nm from Gannet Rock daybeacon. You steer 357°T at 5.9 kn until 1050, then 231°T at 8.6 kn until 1115.

   Give the 1115 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 1350 you fix your position 354°T, 1.7 nm from Kittle water tank. You steer 335°T at 4.0 kn until 1425, then 242°T at 8.5 kn until 1505.

   Give the 1505 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 1000 you fix your position 052°T, 4.2 nm from Westfield church spire. You steer 115°T at 4.0 kn until 1025, then 306°T at 4.1 kn until 1050.

   Give the 1050 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 1300 you fix your position 073°T, 2.8 nm from Gannet Rock daybeacon. You steer 228°T at 4.9 kn until 1315, then 350°T at 5.0 kn until 1355.

   Give the 1355 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 1210 you fix your position 270°T, 3.2 nm from Tern Island tower. You steer 300°T at 9.6 kn until 1225, then 132°T at 9.8 kn until 1310.

   Give the 1310 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 1545 you fix your position 039°T, 4.7 nm from Gannet Rock daybeacon. You steer 247°T at 9.0 kn until 1605, then 095°T at 5.7 kn until 1620.

   Give the 1620 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  

7. At 0715 you fix your position 060°T, 2.6 nm from Gannet Rock daybeacon. You steer 356°T at 7.9 kn until 0740, then 151°T at 9.4 kn until 0750.

   Give the 0750 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  

8. At 0735 you fix your position 027°T, 1.6 nm from Gannet Rock daybeacon. You steer 087°T at 6.0 kn until 0745, then 203°T at 7.8 kn until 0810.

   Give the 0810 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