Worksheet 591 · Skill 3

Dead reckoning

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1. At 1430 you fix your position 337°T, 1.9 nm from Tern Island tower. You steer 226°T at 7.2 kn until 1505, then 029°T at 5.5 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  

2. At 1235 you fix your position 240°T, 2.3 nm from Tern Island tower. You steer 323°T at 5.8 kn until 1300, then 062°T at 6.1 kn until 1335.

   Give the 1335 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 1015 you fix your position 275°T, 3.1 nm from Tern Island tower. You steer 005°T at 9.9 kn until 1025, then 266°T at 6.9 kn until 1045.

   Give the 1045 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 1010 you fix your position 007°T, 3.1 nm from Westfield church spire. You steer 075°T at 9.7 kn until 1020, then 187°T at 9.0 kn until 1045.

   Give the 1045 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 0740 you fix your position 351°T, 3.2 nm from Mill stack. You steer 164°T at 7.3 kn until 0800, then 340°T at 6.3 kn until 0820.

   Give the 0820 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  

6. At 1315 you fix your position 082°T, 2.3 nm from Westfield church spire. You steer 070°T at 9.8 kn until 1335, then 217°T at 5.4 kn until 1410.

   Give the 1410 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

7. At 1225 you fix your position 080°T, 2.4 nm from Westfield church spire. You steer 029°T at 7.3 kn until 1245, then 197°T at 8.5 kn until 1310.

   Give the 1310 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

8. At 1240 you fix your position 029°T, 3.6 nm from Westfield church spire. You steer 195°T at 4.1 kn until 1250, then 080°T at 7.0 kn until 1305.

   Give the 1305 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