Worksheet 470 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 018°T, 2.1 nm from Gannet Rock daybeacon. You steer 309°T at 7.2 kn until 1110, then 066°T at 9.6 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  

2. At 1435 you fix your position 060°T, 2.0 nm from Heron Point Light. You steer 039°T at 4.1 kn until 1515, then 099°T at 7.4 kn until 1555.

   Give the 1555 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 1440 you fix your position 015°T, 1.7 nm from Heron Point Light. You steer 034°T at 4.6 kn until 1450, then 069°T at 6.0 kn until 1515.

   Give the 1515 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 0740 you fix your position 030°T, 2.8 nm from Heron Point Light. You steer 085°T at 4.7 kn until 0755, then 012°T at 9.7 kn until 0815.

   Give the 0815 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 0905 you fix your position 271°T, 1.9 nm from Tern Island tower. You steer 133°T at 4.0 kn until 0925, then 180°T at 9.7 kn until 0940.

   Give the 0940 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  

6. At 0720 you fix your position 291°T, 3.3 nm from Tern Island tower. You steer 240°T at 9.9 kn until 0740, then 171°T at 8.9 kn until 0750.

   Give the 0750 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  

7. At 1010 you fix your position 078°T, 1.6 nm from Gannet Rock daybeacon. You steer 314°T at 4.1 kn until 1025, then 248°T at 5.4 kn until 1110.

   Give the 1110 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  

8. At 1145 you fix your position 209°T, 1.9 nm from Tern Island tower. You steer 226°T at 8.6 kn until 1210, then 126°T at 7.6 kn until 1225.

   Give the 1225 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