Worksheet 588 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 052°T, 3.0 nm from Tern Island tower. You steer 174°T at 4.7 kn until 1020, then 310°T at 5.7 kn until 1035.

   Give the 1035 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 0850 you fix your position 310°T, 1.5 nm from Gannet Rock daybeacon. You steer 292°T at 4.0 kn until 0900, then 153°T at 6.6 kn until 0910.

   Give the 0910 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 0705 you fix your position 022°T, 2.8 nm from Gannet Rock daybeacon. You steer 179°T at 4.5 kn until 0750, then 248°T at 4.2 kn until 0830.

   Give the 0830 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 1225 you fix your position 014°T, 2.8 nm from Mill stack. You steer 280°T at 6.9 kn until 1310, then 079°T at 9.9 kn until 1355.

   Give the 1355 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 1230 you fix your position 002°T, 3.1 nm from Mill stack. You steer 341°T at 6.8 kn until 1240, then 150°T at 6.1 kn until 1305.

   Give the 1305 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 1045 you fix your position 099°T, 2.3 nm from Gannet Rock daybeacon. You steer 007°T at 7.1 kn until 1105, then 208°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  

7. At 1450 you fix your position 255°T, 2.2 nm from Tern Island tower. You steer 263°T at 4.8 kn until 1500, then 009°T at 6.8 kn until 1520.

   Give the 1520 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 1005 you fix your position 040°T, 3.8 nm from Gannet Rock daybeacon. You steer 183°T at 6.5 kn until 1025, then 254°T at 4.7 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