Worksheet 679 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 048°T, 3.1 nm from Gannet Rock daybeacon. You steer 005°T at 4.8 kn until 1350, then 256°T at 4.0 kn until 1400.

   Give the 1400 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  

2. At 1310 you fix your position 100°T, 2.4 nm from Gannet Rock daybeacon. You steer 260°T at 9.6 kn until 1335, then 034°T at 4.6 kn until 1350.

   Give the 1350 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 1120 you fix your position 114°T, 2.3 nm from Westfield church spire. You steer 353°T at 10.0 kn until 1145, then 152°T at 9.4 kn until 1215.

   Give the 1215 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 1505 you fix your position 327°T, 1.9 nm from Tern Island tower. You steer 206°T at 8.2 kn until 1520, then 147°T at 6.4 kn until 1600.

   Give the 1600 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 1200 you fix your position 232°T, 1.3 nm from Tern Island tower. You steer 232°T at 7.2 kn until 1235, then 135°T at 9.8 kn until 1245.

   Give the 1245 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  

6. At 1155 you fix your position 197°T, 1.6 nm from Tern Island tower. You steer 221°T at 4.4 kn until 1205, then 255°T at 7.8 kn until 1240.

   Give the 1240 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 021°T, 1.7 nm from Heron Point Light. You steer 045°T at 7.9 kn until 1310, then 303°T at 5.7 kn until 1325.

   Give the 1325 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 1450 you fix your position 203°T, 1.3 nm from Gannet Rock daybeacon. You steer 243°T at 8.9 kn until 1510, then 325°T at 4.6 kn until 1550.

   Give the 1550 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