Worksheet 776 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 268°T, 1.5 nm from Gannet Rock daybeacon. You steer 262°T at 5.3 kn until 1250, then 076°T at 5.2 kn until 1330.

   Give the 1330 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  

2. At 1335 you fix your position 353°T, 1.6 nm from Gannet Rock daybeacon. You steer 274°T at 4.2 kn until 1345, then 180°T at 4.9 kn until 1415.

   Give the 1415 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  

3. At 1420 you fix your position 255°T, 2.7 nm from Tern Island tower. You steer 101°T at 5.8 kn until 1450, then 268°T at 6.7 kn until 1525.

   Give the 1525 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 1155 you fix your position 023°T, 1.7 nm from Tern Island tower. You steer 260°T at 4.2 kn until 1225, then 230°T at 5.1 kn until 1305.

   Give the 1305 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  

5. At 0955 you fix your position 042°T, 2.8 nm from Westfield church spire. You steer 023°T at 6.0 kn until 1010, then 135°T at 5.4 kn until 1050.

   Give the 1050 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 0950 you fix your position 078°T, 3.3 nm from Westfield church spire. You steer 180°T at 8.4 kn until 1000, then 086°T at 6.7 kn until 1030.

   Give the 1030 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 0900 you fix your position 237°T, 2.1 nm from Tern Island tower. You steer 281°T at 7.3 kn until 0940, then 141°T at 6.7 kn until 0955.

   Give the 0955 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  

8. At 1135 you fix your position 015°T, 2.2 nm from Mill stack. You steer 348°T at 6.7 kn until 1205, then 208°T at 5.4 kn until 1245.

   Give the 1245 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