Worksheet 475 · Skill 3

Dead reckoning

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1. At 1245 you fix your position 015°T, 2.2 nm from Heron Point Light. You steer 006°T at 5.1 kn until 1320, then 229°T at 9.2 kn until 1335.

   Give the 1335 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 1530 you fix your position 093°T, 3.0 nm from Westfield church spire. You steer 098°T at 6.0 kn until 1550, then 292°T at 6.0 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 1210 you fix your position 031°T, 3.4 nm from Heron Point Light. You steer 031°T at 6.3 kn until 1250, then 081°T at 7.4 kn until 1320.

   Give the 1320 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 0825 you fix your position 203°T, 2.9 nm from Tern Island tower. You steer 160°T at 6.0 kn until 0835, then 022°T at 9.8 kn until 0850.

   Give the 0850 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 0940 you fix your position 137°T, 1.4 nm from Tern Island tower. You steer 176°T at 9.9 kn until 1000, then 096°T at 9.2 kn until 1020.

   Give the 1020 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

6. At 1525 you fix your position 067°T, 5.1 nm from Tern Island tower. You steer 243°T at 4.0 kn until 1545, then 318°T at 6.9 kn until 1555.

   Give the 1555 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 1400 you fix your position 034°T, 1.7 nm from Gannet Rock daybeacon. You steer 323°T at 4.7 kn until 1430, then 086°T at 5.2 kn until 1505.

   Give the 1505 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 1405 you fix your position 028°T, 2.4 nm from Heron Point Light. You steer 019°T at 6.9 kn until 1430, then 313°T at 7.9 kn until 1450.

   Give the 1450 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