Worksheet 41 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 268°T, 3.3 nm from Tern Island tower. You steer 225°T at 8.4 kn until 1255, then 018°T at 9.9 kn until 1315.

   Give the 1315 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 1000 you fix your position 060°T, 2.0 nm from Tern Island tower. You steer 135°T at 9.0 kn until 1010, then 190°T at 5.9 kn until 1030.

   Give the 1030 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 1420 you fix your position 321°T, 2.1 nm from Tern Island tower. You steer 211°T at 4.2 kn until 1445, then 278°T at 5.6 kn until 1525.

   Give the 1525 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 1105 you fix your position 043°T, 1.4 nm from Gannet Rock daybeacon. You steer 359°T at 5.8 kn until 1125, then 101°T at 6.6 kn until 1135.

   Give the 1135 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 1520 you fix your position 352°T, 3.0 nm from Mill stack. You steer 271°T at 6.7 kn until 1555, then 004°T at 6.7 kn until 1625.

   Give the 1625 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 1305 you fix your position 326°T, 2.7 nm from Kittle water tank. You steer 333°T at 6.0 kn until 1325, then 053°T at 4.3 kn until 1400.

   Give the 1400 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 0820 you fix your position 008°T, 2.6 nm from Mill stack. You steer 338°T at 6.4 kn until 0900, then 123°T at 9.3 kn until 0915.

   Give the 0915 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 1300 you fix your position 063°T, 4.7 nm from Tern Island tower. You steer 180°T at 6.8 kn until 1345, then 262°T at 9.5 kn until 1355.

   Give the 1355 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