Worksheet 513 · Skill 3

Dead reckoning

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1. At 1520 you fix your position 221°T, 2.1 nm from Tern Island tower. You steer 099°T at 4.4 kn until 1540, then 281°T at 4.6 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  

2. At 0810 you fix your position 133°T, 3.0 nm from Tern Island tower. You steer 315°T at 4.6 kn until 0825, then 071°T at 9.4 kn until 0845.

   Give the 0845 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 1105 you fix your position 331°T, 1.3 nm from Tern Island tower. You steer 314°T at 6.5 kn until 1120, then 102°T at 4.9 kn until 1135.

   Give the 1135 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 1105 you fix your position 209°T, 2.1 nm from Tern Island tower. You steer 078°T at 9.3 kn until 1145, then 239°T at 5.5 kn until 1215.

   Give the 1215 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 1120 you fix your position 170°T, 1.4 nm from Tern Island tower. You steer 139°T at 5.6 kn until 1130, then 225°T at 6.1 kn until 1155.

   Give the 1155 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 1035 you fix your position 347°T, 1.7 nm from Tern Island tower. You steer 278°T at 10.0 kn until 1110, then 098°T at 9.3 kn until 1125.

   Give the 1125 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 0810 you fix your position 011°T, 3.4 nm from Westfield church spire. You steer 177°T at 7.8 kn until 0835, then 105°T at 7.2 kn until 0845.

   Give the 0845 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  

8. At 1245 you fix your position 209°T, 1.2 nm from Gannet Rock daybeacon. You steer 062°T at 7.0 kn until 1310, then 239°T at 5.6 kn until 1325.

   Give the 1325 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