Worksheet 391 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 052°T, 3.8 nm from Gannet Rock daybeacon. You steer 334°T at 9.4 kn until 1250, then 086°T at 5.9 kn until 1300.

   Give the 1300 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 1445 you fix your position 053°T, 3.3 nm from Tern Island tower. You steer 165°T at 6.2 kn until 1515, then 315°T at 6.8 kn until 1530.

   Give the 1530 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  

3. At 1235 you fix your position 057°T, 2.6 nm from Heron Point Light. You steer 173°T at 6.2 kn until 1250, then 003°T at 4.2 kn until 1335.

   Give the 1335 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  

4. At 1300 you fix your position 055°T, 2.5 nm from Tern Island tower. You steer 200°T at 4.3 kn until 1340, then 256°T at 9.2 kn until 1420.

   Give the 1420 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 0850 you fix your position 084°T, 3.4 nm from Westfield church spire. You steer 236°T at 4.0 kn until 0900, then 330°T at 8.1 kn until 0910.

   Give the 0910 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 0705 you fix your position 305°T, 3.9 nm from Tern Island tower. You steer 206°T at 8.0 kn until 0735, then 108°T at 4.4 kn until 0745.

   Give the 0745 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 1130 you fix your position 045°T, 1.9 nm from Heron Point Light. You steer 082°T at 8.5 kn until 1145, then 348°T at 8.3 kn until 1200.

   Give the 1200 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 1010 you fix your position 099°T, 1.8 nm from Gannet Rock daybeacon. You steer 191°T at 4.4 kn until 1025, then 296°T at 4.4 kn until 1110.

   Give the 1110 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