Worksheet 381 · Skill 3

Dead reckoning

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1. At 0805 you fix your position 350°T, 2.0 nm from Tern Island tower. You steer 241°T at 7.6 kn until 0825, then 072°T at 5.3 kn until 0900.

   Give the 0900 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 1545 you fix your position 089°T, 1.3 nm from Westfield church spire. You steer 053°T at 5.1 kn until 1620, then 313°T at 6.1 kn until 1645.

   Give the 1645 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  

3. At 1445 you fix your position 044°T, 3.1 nm from Gannet Rock daybeacon. You steer 208°T at 8.4 kn until 1510, then 272°T at 8.9 kn until 1535.

   Give the 1535 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  

4. At 1140 you fix your position 291°T, 1.6 nm from Tern Island tower. You steer 241°T at 8.3 kn until 1210, then 098°T at 6.2 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  

5. At 1355 you fix your position 241°T, 2.4 nm from Gannet Rock daybeacon. You steer 124°T at 6.9 kn until 1405, then 291°T at 8.6 kn until 1415.

   Give the 1415 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 1550 you fix your position 121°T, 2.0 nm from Westfield church spire. You steer 121°T at 8.5 kn until 1610, then 164°T at 4.4 kn until 1635.

   Give the 1635 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  

7. At 0810 you fix your position 259°T, 3.4 nm from Tern Island tower. You steer 279°T at 6.5 kn until 0835, then 097°T at 6.8 kn until 0855.

   Give the 0855 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 0735 you fix your position 085°T, 3.2 nm from Westfield church spire. You steer 206°T at 6.0 kn until 0755, then 117°T at 9.8 kn until 0815.

   Give the 0815 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