Worksheet 446 · Skill 3

Dead reckoning

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1. At 1430 you fix your position 021°T, 1.6 nm from Kittle water tank. You steer 280°T at 9.7 kn until 1500, then 207°T at 4.2 kn until 1525.

   Give the 1525 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 1100 you fix your position 290°T, 3.7 nm from Tern Island tower. You steer 184°T at 5.5 kn until 1125, then 331°T at 7.3 kn until 1155.

   Give the 1155 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  

3. At 0735 you fix your position 314°T, 3.4 nm from Tern Island tower. You steer 205°T at 6.8 kn until 0810, then 029°T at 5.7 kn until 0850.

   Give the 0850 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 1225 you fix your position 103°T, 2.8 nm from Westfield church spire. You steer 142°T at 4.7 kn until 1235, then 324°T at 8.3 kn until 1300.

   Give the 1300 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 1400 you fix your position 152°T, 2.5 nm from Tern Island tower. You steer 046°T at 4.6 kn until 1445, then 178°T at 9.4 kn until 1505.

   Give the 1505 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 1325 you fix your position 174°T, 1.0 nm from Gannet Rock daybeacon. You steer 286°T at 5.1 kn until 1410, then 048°T at 4.7 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  

7. At 1125 you fix your position 078°T, 2.7 nm from Westfield church spire. You steer 258°T at 6.5 kn until 1140, then 088°T at 8.3 kn until 1155.

   Give the 1155 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 0850 you fix your position 070°T, 2.4 nm from Westfield church spire. You steer 144°T at 4.8 kn until 0900, then 308°T at 7.7 kn until 0920.

   Give the 0920 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