Worksheet 128 · Skill 3

Dead reckoning

Print this worksheet Next sheet

Plot Pass worksheet. Plot Pass $1.95/month or $19.50/year · Free during preview. Plotroom · cedarpointmarina.net · invented chart, not for navigation.

1. At 1225 you fix your position 032°T, 2.8 nm from Gannet Rock daybeacon. You steer 356°T at 5.1 kn until 1240, then 220°T at 6.4 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  

2. At 0925 you fix your position 063°T, 2.3 nm from Gannet Rock daybeacon. You steer 185°T at 4.6 kn until 0950, then 355°T at 7.8 kn until 1035.

   Give the 1035 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  

3. At 0720 you fix your position 086°T, 3.1 nm from Westfield church spire. You steer 080°T at 5.8 kn until 0735, then 135°T at 7.1 kn until 0810.

   Give the 0810 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  

4. At 0805 you fix your position 211°T, 3.2 nm from Tern Island tower. You steer 339°T at 7.6 kn until 0830, then 156°T at 9.0 kn until 0845.

   Give the 0845 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 0945 you fix your position 286°T, 1.6 nm from Gannet Rock daybeacon. You steer 298°T at 6.6 kn until 1005, then 188°T at 8.1 kn until 1035.

   Give the 1035 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 1525 you fix your position 078°T, 1.2 nm from Gannet Rock daybeacon. You steer 320°T at 4.1 kn until 1555, then 009°T at 5.2 kn until 1620.

   Give the 1620 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  

7. At 1300 you fix your position 088°T, 1.7 nm from Westfield church spire. You steer 042°T at 6.9 kn until 1325, then 172°T at 4.0 kn until 1355.

   Give the 1355 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 0920 you fix your position 223°T, 2.7 nm from Tern Island tower. You steer 217°T at 5.3 kn until 0940, then 357°T at 5.4 kn until 1025.

   Give the 1025 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