Worksheet 65 · Skill 3

Dead reckoning

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1. At 0700 you fix your position 196°T, 2.0 nm from Gannet Rock daybeacon. You steer 000°T at 9.4 kn until 0710, then 172°T at 5.8 kn until 0720.

   Give the 0720 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 1050 you fix your position 064°T, 3.7 nm from Westfield church spire. You steer 164°T at 7.3 kn until 1120, then 089°T at 5.6 kn until 1135.

   Give the 1135 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 1600 you fix your position 025°T, 2.0 nm from Kittle water tank. You steer 281°T at 9.6 kn until 1620, then 152°T at 6.5 kn until 1630.

   Give the 1630 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  

4. At 1040 you fix your position 248°T, 2.8 nm from Tern Island tower. You steer 352°T at 5.1 kn until 1115, then 258°T at 7.3 kn until 1135.

   Give the 1135 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  

5. At 1325 you fix your position 064°T, 3.4 nm from Tern Island tower. You steer 047°T at 4.3 kn until 1335, then 191°T at 8.1 kn until 1420.

   Give the 1420 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 0730 you fix your position 355°T, 2.5 nm from Mill stack. You steer 314°T at 9.2 kn until 0805, then 130°T at 9.2 kn until 0815.

   Give the 0815 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  

7. At 1510 you fix your position 227°T, 2.2 nm from Gannet Rock daybeacon. You steer 316°T at 9.4 kn until 1540, then 245°T at 5.6 kn until 1605.

   Give the 1605 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  

8. At 1445 you fix your position 019°T, 2.3 nm from Tern Island tower. You steer 259°T at 9.4 kn until 1505, then 192°T at 7.2 kn until 1525.

   Give the 1525 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