Worksheet 698 · Skill 3

Dead reckoning

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1. At 1310 you fix your position 022°T, 1.8 nm from Mill stack. You steer 068°T at 4.1 kn until 1355, then 297°T at 6.3 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  

2. At 1150 you fix your position 256°T, 2.2 nm from Gannet Rock daybeacon. You steer 035°T at 4.6 kn until 1210, then 293°T at 7.5 kn until 1220.

   Give the 1220 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 0725 you fix your position 206°T, 3.2 nm from Tern Island tower. You steer 285°T at 4.4 kn until 0800, then 152°T at 4.2 kn until 0840.

   Give the 0840 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  

4. At 0715 you fix your position 218°T, 3.5 nm from Tern Island tower. You steer 111°T at 9.6 kn until 0725, then 321°T at 9.3 kn until 0740.

   Give the 0740 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  

5. At 1455 you fix your position 280°T, 1.5 nm from Gannet Rock daybeacon. You steer 065°T at 8.2 kn until 1520, then 284°T at 9.8 kn until 1530.

   Give the 1530 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 1300 you fix your position 019°T, 2.3 nm from Westfield church spire. You steer 154°T at 4.2 kn until 1345, then 320°T at 5.3 kn until 1355.

   Give the 1355 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 1005 you fix your position 094°T, 2.7 nm from Westfield church spire. You steer 221°T at 4.1 kn until 1020, then 352°T at 6.6 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  

8. At 1120 you fix your position 275°T, 1.9 nm from Tern Island tower. You steer 242°T at 4.6 kn until 1150, then 135°T at 5.2 kn until 1235.

   Give the 1235 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