Worksheet 425 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 000°T, 1.6 nm from Tern Island tower. You steer 260°T at 7.5 kn until 1620, then 166°T at 10.0 kn until 1645.

   Give the 1645 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 0755 you fix your position 299°T, 3.1 nm from Tern Island tower. You steer 240°T at 5.4 kn until 0835, then 148°T at 9.4 kn until 0900.

   Give the 0900 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  

3. At 0830 you fix your position 043°T, 2.0 nm from Westfield church spire. You steer 138°T at 6.1 kn until 0910, then 256°T at 5.9 kn until 0930.

   Give the 0930 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 1250 you fix your position 299°T, 2.9 nm from Tern Island tower. You steer 098°T at 4.8 kn until 1305, then 217°T at 6.0 kn until 1350.

   Give the 1350 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  

5. At 1330 you fix your position 071°T, 4.9 nm from Tern Island tower. You steer 238°T at 4.4 kn until 1345, then 002°T at 4.9 kn until 1355.

   Give the 1355 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 1120 you fix your position 267°T, 2.7 nm from Tern Island tower. You steer 325°T at 9.4 kn until 1135, then 188°T at 7.6 kn until 1220.

   Give the 1220 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  

7. At 1255 you fix your position 057°T, 1.3 nm from Gannet Rock daybeacon. You steer 304°T at 9.9 kn until 1305, then 248°T at 6.8 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  

8. At 0855 you fix your position 255°T, 2.1 nm from Tern Island tower. You steer 206°T at 4.4 kn until 0940, then 079°T at 8.4 kn until 0950.

   Give the 0950 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