Worksheet 4 · Skill 3

Dead reckoning

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1. At 1555 you fix your position 046°T, 3.9 nm from Westfield church spire. You steer 135°T at 6.6 kn until 1605, then 280°T at 9.5 kn until 1615.

   Give the 1615 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  

2. At 1555 you fix your position 035°T, 3.2 nm from Westfield church spire. You steer 261°T at 4.4 kn until 1620, then 156°T at 5.4 kn until 1635.

   Give the 1635 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 1100 you fix your position 172°T, 1.0 nm from Westfield church spire. You steer 118°T at 5.1 kn until 1135, then 173°T at 5.1 kn until 1145.

   Give the 1145 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  

4. At 1330 you fix your position 078°T, 1.4 nm from Gannet Rock daybeacon. You steer 279°T at 9.7 kn until 1355, then 154°T at 6.2 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  

5. At 1520 you fix your position 002°T, 2.1 nm from Heron Point Light. You steer 163°T at 7.8 kn until 1535, then 058°T at 6.6 kn until 1610.

   Give the 1610 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 1150 you fix your position 255°T, 1.9 nm from Gannet Rock daybeacon. You steer 241°T at 6.6 kn until 1215, then 327°T at 4.0 kn until 1240.

   Give the 1240 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 0925 you fix your position 286°T, 1.9 nm from Tern Island tower. You steer 197°T at 4.4 kn until 0940, then 145°T at 8.7 kn until 0950.

   Give the 0950 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  

8. At 1445 you fix your position 018°T, 2.5 nm from Westfield church spire. You steer 121°T at 8.8 kn until 1520, then 259°T at 4.5 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