Worksheet 290 · Skill 3

Dead reckoning

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1. At 0830 you fix your position 098°T, 2.9 nm from Gannet Rock daybeacon. You steer 234°T at 5.5 kn until 0850, then 343°T at 9.5 kn until 0915.

   Give the 0915 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 1510 you fix your position 059°T, 2.0 nm from Westfield church spire. You steer 162°T at 9.9 kn until 1535, then 337°T at 4.7 kn until 1555.

   Give the 1555 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 1210 you fix your position 234°T, 2.5 nm from Tern Island tower. You steer 197°T at 4.4 kn until 1240, then 231°T at 4.4 kn until 1250.

   Give the 1250 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 1230 you fix your position 008°T, 1.2 nm from Gannet Rock daybeacon. You steer 008°T at 8.7 kn until 1250, then 170°T at 4.4 kn until 1330.

   Give the 1330 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 1435 you fix your position 082°T, 2.6 nm from Westfield church spire. You steer 260°T at 5.8 kn until 1445, then 037°T at 5.2 kn until 1505.

   Give the 1505 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 1255 you fix your position 047°T, 1.7 nm from Heron Point Light. You steer 058°T at 9.3 kn until 1305, then 262°T at 4.1 kn until 1340.

   Give the 1340 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 0950 you fix your position 038°T, 3.4 nm from Heron Point Light. You steer 250°T at 7.3 kn until 1000, then 121°T at 5.0 kn until 1030.

   Give the 1030 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  

8. At 1210 you fix your position 150°T, 2.6 nm from Tern Island tower. You steer 237°T at 7.3 kn until 1250, then 084°T at 6.6 kn until 1320.

   Give the 1320 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