Worksheet 1 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 251°T, 3.3 nm from Tern Island tower. You steer 341°T at 9.6 kn until 1355, then 070°T at 6.3 kn until 1410.

   Give the 1410 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 1450 you fix your position 229°T, 2.3 nm from Gannet Rock daybeacon. You steer 004°T at 8.2 kn until 1510, then 190°T at 5.2 kn until 1555.

   Give the 1555 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  

3. At 1310 you fix your position 039°T, 2.3 nm from Tern Island tower. You steer 114°T at 5.5 kn until 1340, then 295°T at 4.3 kn until 1420.

   Give the 1420 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 1155 you fix your position 046°T, 3.9 nm from Gannet Rock daybeacon. You steer 344°T at 5.1 kn until 1215, then 228°T at 7.9 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  

5. At 1315 you fix your position 043°T, 3.0 nm from Heron Point Light. You steer 246°T at 4.5 kn until 1350, then 111°T at 6.3 kn until 1425.

   Give the 1425 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 0825 you fix your position 313°T, 1.4 nm from Tern Island tower. You steer 043°T at 10.0 kn until 0835, then 171°T at 5.1 kn until 0845.

   Give the 0845 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  

7. At 1420 you fix your position 283°T, 2.6 nm from Tern Island tower. You steer 205°T at 6.2 kn until 1500, then 071°T at 8.6 kn until 1510.

   Give the 1510 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  

8. At 1535 you fix your position 273°T, 1.2 nm from Gannet Rock daybeacon. You steer 258°T at 7.2 kn until 1615, then 049°T at 7.9 kn until 1640.

   Give the 1640 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