Worksheet 135 · Skill 3

Dead reckoning

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1. At 1510 you fix your position 258°T, 2.1 nm from Tern Island tower. You steer 010°T at 4.4 kn until 1535, then 244°T at 6.4 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 0905 you fix your position 269°T, 2.4 nm from Tern Island tower. You steer 325°T at 6.6 kn until 0925, then 186°T at 4.0 kn until 1005.

   Give the 1005 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 1430 you fix your position 030°T, 3.0 nm from Heron Point Light. You steer 057°T at 8.8 kn until 1450, then 001°T at 6.1 kn until 1515.

   Give the 1515 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  

4. At 0915 you fix your position 067°T, 4.0 nm from Tern Island tower. You steer 191°T at 6.5 kn until 0940, then 093°T at 7.9 kn until 0950.

   Give the 0950 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 1225 you fix your position 345°T, 2.0 nm from Mill stack. You steer 344°T at 5.1 kn until 1250, then 306°T at 6.3 kn until 1315.

   Give the 1315 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  

6. At 1330 you fix your position 013°T, 2.0 nm from Gannet Rock daybeacon. You steer 203°T at 7.1 kn until 1340, then 145°T at 7.4 kn until 1355.

   Give the 1355 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  

7. At 1035 you fix your position 090°T, 3.5 nm from Westfield church spire. You steer 136°T at 7.6 kn until 1110, then 019°T at 4.2 kn until 1120.

   Give the 1120 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 1325 you fix your position 341°T, 2.0 nm from Tern Island tower. You steer 208°T at 7.5 kn until 1400, then 261°T at 6.8 kn until 1420.

   Give the 1420 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