Worksheet 75 · Skill 3

Dead reckoning

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1. At 1320 you fix your position 093°T, 2.7 nm from Gannet Rock daybeacon. You steer 322°T at 7.0 kn until 1350, then 135°T at 5.1 kn until 1435.

   Give the 1435 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 1115 you fix your position 102°T, 2.6 nm from Westfield church spire. You steer 020°T at 6.2 kn until 1140, then 280°T at 4.5 kn until 1215.

   Give the 1215 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 088°T, 2.2 nm from Westfield church spire. You steer 120°T at 4.4 kn until 1500, then 038°T at 6.5 kn until 1530.

   Give the 1530 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 1310 you fix your position 066°T, 3.4 nm from Westfield church spire. You steer 105°T at 4.1 kn until 1325, then 164°T at 9.8 kn until 1340.

   Give the 1340 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 1105 you fix your position 080°T, 3.3 nm from Westfield church spire. You steer 127°T at 7.9 kn until 1120, then 013°T at 7.1 kn until 1130.

   Give the 1130 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 1235 you fix your position 260°T, 3.1 nm from Gannet Rock daybeacon. You steer 127°T at 6.6 kn until 1255, then 276°T at 4.1 kn until 1310.

   Give the 1310 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 0750 you fix your position 357°T, 1.8 nm from Gannet Rock daybeacon. You steer 227°T at 9.4 kn until 0825, then 019°T at 7.2 kn until 0835.

   Give the 0835 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  

8. At 1310 you fix your position 101°T, 2.6 nm from Gannet Rock daybeacon. You steer 268°T at 5.0 kn until 1325, then 340°T at 7.8 kn until 1405.

   Give the 1405 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