Worksheet 274 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 059°T, 3.7 nm from Westfield church spire. You steer 165°T at 6.2 kn until 1510, then 064°T at 6.1 kn until 1540.

   Give the 1540 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 1350 you fix your position 296°T, 2.5 nm from Tern Island tower. You steer 156°T at 4.3 kn until 1400, then 209°T at 4.0 kn until 1435.

   Give the 1435 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  

3. At 1250 you fix your position 107°T, 2.5 nm from Westfield church spire. You steer 348°T at 4.4 kn until 1305, then 035°T at 8.8 kn until 1320.

   Give the 1320 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 1250 you fix your position 304°T, 1.8 nm from Kittle water tank. You steer 352°T at 6.5 kn until 1300, then 129°T at 6.3 kn until 1310.

   Give the 1310 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 1320 you fix your position 042°T, 1.3 nm from Gannet Rock daybeacon. You steer 165°T at 6.3 kn until 1350, then 293°T at 8.2 kn until 1430.

   Give the 1430 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 1440 you fix your position 286°T, 2.4 nm from Tern Island tower. You steer 303°T at 6.4 kn until 1500, then 144°T at 4.6 kn until 1510.

   Give the 1510 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  

7. At 1510 you fix your position 059°T, 3.8 nm from Westfield church spire. You steer 180°T at 8.0 kn until 1550, then 090°T at 6.4 kn until 1620.

   Give the 1620 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  

8. At 1225 you fix your position 005°T, 1.0 nm from Gannet Rock daybeacon. You steer 252°T at 4.9 kn until 1305, then 088°T at 4.1 kn until 1330.

   Give the 1330 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