Worksheet 744 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 081°T, 2.1 nm from Westfield church spire. You steer 329°T at 5.0 kn until 1120, then 171°T at 4.8 kn until 1205.

   Give the 1205 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  

2. At 1350 you fix your position 093°T, 3.3 nm from Westfield church spire. You steer 105°T at 4.2 kn until 1420, then 261°T at 5.1 kn until 1505.

   Give the 1505 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 1120 you fix your position 010°T, 1.3 nm from Heron Point Light. You steer 003°T at 5.8 kn until 1200, then 108°T at 4.7 kn until 1215.

   Give the 1215 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 1355 you fix your position 032°T, 1.4 nm from Heron Point Light. You steer 089°T at 6.4 kn until 1420, then 054°T at 9.9 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  

5. At 0950 you fix your position 019°T, 0.9 nm from Gannet Rock daybeacon. You steer 011°T at 6.3 kn until 1025, then 272°T at 9.0 kn until 1110.

   Give the 1110 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 0800 you fix your position 236°T, 2.5 nm from Gannet Rock daybeacon. You steer 339°T at 6.7 kn until 0825, then 308°T at 6.9 kn until 0845.

   Give the 0845 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 007°T, 2.7 nm from Mill stack. You steer 174°T at 6.4 kn until 1135, then 083°T at 6.7 kn until 1155.

   Give the 1155 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  

8. At 1000 you fix your position 044°T, 2.1 nm from Westfield church spire. You steer 102°T at 9.2 kn until 1015, then 057°T at 9.8 kn until 1040.

   Give the 1040 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