Worksheet 732 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 281°T, 3.2 nm from Tern Island tower. You steer 174°T at 7.8 kn until 0810, then 006°T at 9.1 kn until 0835.

   Give the 0835 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 0920 you fix your position 072°T, 1.8 nm from Heron Point Light. You steer 108°T at 5.9 kn until 0955, then 057°T at 7.6 kn until 1040.

   Give the 1040 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 1135 you fix your position 070°T, 1.1 nm from Gannet Rock daybeacon. You steer 206°T at 5.0 kn until 1205, then 318°T at 7.1 kn until 1245.

   Give the 1245 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 1535 you fix your position 295°T, 3.0 nm from Tern Island tower. You steer 146°T at 5.1 kn until 1610, then 219°T at 6.5 kn until 1625.

   Give the 1625 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  

5. At 1525 you fix your position 080°T, 1.7 nm from Tern Island tower. You steer 336°T at 5.8 kn until 1545, then 171°T at 8.5 kn until 1555.

   Give the 1555 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 1520 you fix your position 256°T, 1.6 nm from Gannet Rock daybeacon. You steer 326°T at 5.1 kn until 1545, then 168°T at 7.6 kn until 1605.

   Give the 1605 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  

7. At 1305 you fix your position 302°T, 1.6 nm from Gannet Rock daybeacon. You steer 097°T at 5.1 kn until 1335, then 047°T at 6.6 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  

8. At 1220 you fix your position 300°T, 4.2 nm from Tern Island tower. You steer 190°T at 6.7 kn until 1235, then 011°T at 4.9 kn until 1250.

   Give the 1250 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