Worksheet 119 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 098°T, 2.7 nm from Westfield church spire. You steer 227°T at 4.6 kn until 1505, then 043°T at 4.9 kn until 1515.

   Give the 1515 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 0920 you fix your position 043°T, 3.0 nm from Gannet Rock daybeacon. You steer 188°T at 8.6 kn until 0945, then 259°T at 9.0 kn until 1025.

   Give the 1025 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  

3. At 1140 you fix your position 035°T, 3.2 nm from Westfield church spire. You steer 305°T at 4.5 kn until 1155, then 192°T at 5.0 kn until 1220.

   Give the 1220 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 1435 you fix your position 015°T, 1.3 nm from Tern Island tower. You steer 123°T at 7.0 kn until 1455, then 306°T at 4.3 kn until 1505.

   Give the 1505 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 1000 you fix your position 054°T, 4.0 nm from Westfield church spire. You steer 218°T at 6.1 kn until 1010, then 171°T at 7.3 kn until 1040.

   Give the 1040 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  

6. At 1100 you fix your position 033°T, 1.6 nm from Westfield church spire. You steer 101°T at 6.3 kn until 1135, then 300°T at 7.8 kn until 1200.

   Give the 1200 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 1430 you fix your position 301°T, 4.7 nm from Tern Island tower. You steer 143°T at 8.4 kn until 1500, then 350°T at 6.7 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  

8. At 1115 you fix your position 035°T, 1.6 nm from Tern Island tower. You steer 136°T at 6.5 kn until 1125, then 054°T at 9.7 kn until 1145.

   Give the 1145 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