Worksheet 38 · Skill 3

Dead reckoning

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1. At 1405 you fix your position 233°T, 2.4 nm from Tern Island tower. You steer 144°T at 6.1 kn until 1415, then 066°T at 7.2 kn until 1445.

   Give the 1445 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  

2. At 1535 you fix your position 002°T, 2.2 nm from Heron Point Light. You steer 011°T at 6.1 kn until 1610, then 302°T at 5.2 kn until 1630.

   Give the 1630 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 0755 you fix your position 177°T, 1.1 nm from Westfield church spire. You steer 096°T at 5.1 kn until 0815, then 051°T at 4.5 kn until 0855.

   Give the 0855 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 1345 you fix your position 209°T, 2.6 nm from Tern Island tower. You steer 292°T at 6.6 kn until 1410, then 098°T at 7.2 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  

5. At 0900 you fix your position 061°T, 3.1 nm from Gannet Rock daybeacon. You steer 220°T at 5.3 kn until 0945, then 258°T at 7.4 kn until 1010.

   Give the 1010 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 1600 you fix your position 070°T, 3.3 nm from Tern Island tower. You steer 215°T at 4.3 kn until 1615, then 150°T at 5.8 kn until 1625.

   Give the 1625 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 1230 you fix your position 244°T, 3.0 nm from Tern Island tower. You steer 140°T at 8.0 kn until 1245, then 350°T at 6.1 kn until 1255.

   Give the 1255 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 1310 you fix your position 168°T, 0.9 nm from Gannet Rock daybeacon. You steer 262°T at 9.5 kn until 1345, then 010°T at 6.0 kn until 1405.

   Give the 1405 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