Worksheet 374 · Skill 3

Dead reckoning

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1. At 1310 you fix your position 104°T, 2.0 nm from Westfield church spire. You steer 044°T at 9.0 kn until 1330, then 162°T at 9.9 kn until 1340.

   Give the 1340 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 1150 you fix your position 342°T, 2.6 nm from Tern Island tower. You steer 221°T at 6.7 kn until 1200, then 089°T at 7.9 kn until 1225.

   Give the 1225 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 0810 you fix your position 040°T, 3.8 nm from Gannet Rock daybeacon. You steer 279°T at 4.9 kn until 0840, then 176°T at 4.9 kn until 0910.

   Give the 0910 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 0745 you fix your position 091°T, 2.2 nm from Westfield church spire. You steer 095°T at 7.4 kn until 0800, then 327°T at 6.5 kn until 0825.

   Give the 0825 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 1125 you fix your position 199°T, 2.2 nm from Tern Island tower. You steer 054°T at 4.7 kn until 1135, then 313°T at 4.9 kn until 1215.

   Give the 1215 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 1535 you fix your position 041°T, 3.8 nm from Westfield church spire. You steer 250°T at 4.2 kn until 1545, then 193°T at 5.7 kn until 1600.

   Give the 1600 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 0720 you fix your position 035°T, 1.9 nm from Kittle water tank. You steer 282°T at 9.3 kn until 0730, then 227°T at 7.0 kn until 0745.

   Give the 0745 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  

8. At 0735 you fix your position 274°T, 1.1 nm from Gannet Rock daybeacon. You steer 351°T at 4.3 kn until 0755, then 177°T at 4.9 kn until 0840.

   Give the 0840 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