Worksheet 125 · Skill 3

Dead reckoning

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1. At 1405 you fix your position 207°T, 2.2 nm from Tern Island tower. You steer 067°T at 4.1 kn until 1435, then 098°T at 8.6 kn until 1450.

   Give the 1450 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 0935 you fix your position 070°T, 2.7 nm from Tern Island tower. You steer 347°T at 4.6 kn until 0945, then 149°T at 6.7 kn until 1000.

   Give the 1000 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 1320 you fix your position 341°T, 1.6 nm from Gannet Rock daybeacon. You steer 252°T at 4.1 kn until 1350, then 308°T at 10.0 kn until 1425.

   Give the 1425 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  

4. At 1400 you fix your position 308°T, 1.6 nm from Kittle water tank. You steer 328°T at 6.9 kn until 1410, then 223°T at 5.3 kn until 1430.

   Give the 1430 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  

5. At 0830 you fix your position 040°T, 2.5 nm from Westfield church spire. You steer 083°T at 4.3 kn until 0855, then 258°T at 8.2 kn until 0915.

   Give the 0915 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 1310 you fix your position 049°T, 3.5 nm from Heron Point Light. You steer 207°T at 10.0 kn until 1325, then 303°T at 4.3 kn until 1335.

   Give the 1335 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

7. At 0835 you fix your position 355°T, 2.2 nm from Mill stack. You steer 312°T at 7.9 kn until 0900, then 052°T at 7.0 kn until 0930.

   Give the 0930 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 1445 you fix your position 293°T, 4.2 nm from Tern Island tower. You steer 222°T at 5.5 kn until 1500, then 135°T at 8.1 kn until 1520.

   Give the 1520 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