Worksheet 346 · Skill 3

Dead reckoning

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1. At 1150 you fix your position 067°T, 3.9 nm from Tern Island tower. You steer 204°T at 5.2 kn until 1230, then 151°T at 9.9 kn until 1240.

   Give the 1240 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 1450 you fix your position 136°T, 2.7 nm from Tern Island tower. You steer 070°T at 7.3 kn until 1500, then 251°T at 5.1 kn until 1545.

   Give the 1545 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 1300 you fix your position 193°T, 2.2 nm from Tern Island tower. You steer 315°T at 6.8 kn until 1330, then 277°T at 6.4 kn until 1350.

   Give the 1350 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  

4. At 1315 you fix your position 262°T, 1.2 nm from Gannet Rock daybeacon. You steer 030°T at 6.3 kn until 1400, then 215°T at 4.0 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  

5. At 0915 you fix your position 055°T, 3.2 nm from Westfield church spire. You steer 068°T at 6.2 kn until 0945, then 166°T at 5.4 kn until 1020.

   Give the 1020 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  

6. At 1325 you fix your position 011°T, 2.2 nm from Mill stack. You steer 122°T at 4.9 kn until 1345, then 288°T at 9.1 kn until 1405.

   Give the 1405 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 1255 you fix your position 074°T, 3.4 nm from Westfield church spire. You steer 227°T at 5.3 kn until 1320, then 071°T at 5.4 kn until 1335.

   Give the 1335 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 1440 you fix your position 068°T, 2.5 nm from Westfield church spire. You steer 322°T at 7.9 kn until 1500, then 157°T at 6.5 kn until 1510.

   Give the 1510 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