Worksheet 316 · Skill 3

Dead reckoning

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1. At 1345 you fix your position 188°T, 1.4 nm from Gannet Rock daybeacon. You steer 274°T at 7.3 kn until 1415, then 359°T at 6.4 kn until 1500.

   Give the 1500 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 1055 you fix your position 248°T, 2.3 nm from Gannet Rock daybeacon. You steer 027°T at 5.3 kn until 1110, then 313°T at 9.1 kn until 1120.

   Give the 1120 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 1040 you fix your position 325°T, 1.1 nm from Gannet Rock daybeacon. You steer 037°T at 4.6 kn until 1050, then 079°T at 4.9 kn until 1120.

   Give the 1120 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  

4. At 1120 you fix your position 075°T, 2.9 nm from Tern Island tower. You steer 314°T at 4.4 kn until 1130, then 214°T at 5.8 kn until 1145.

   Give the 1145 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 1130 you fix your position 094°T, 2.4 nm from Westfield church spire. You steer 117°T at 6.6 kn until 1210, then 334°T at 5.2 kn until 1225.

   Give the 1225 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 0945 you fix your position 051°T, 2.7 nm from Gannet Rock daybeacon. You steer 175°T at 5.6 kn until 1015, then 344°T at 8.0 kn until 1045.

   Give the 1045 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 1045 you fix your position 166°T, 1.5 nm from Gannet Rock daybeacon. You steer 008°T at 8.7 kn until 1115, then 292°T at 5.0 kn until 1150.

   Give the 1150 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 1250 you fix your position 096°T, 1.7 nm from Gannet Rock daybeacon. You steer 114°T at 6.3 kn until 1305, then 320°T at 7.7 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