Worksheet 781 · 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 0800 you fix your position 082°T, 2.4 nm from Westfield church spire. You steer 158°T at 8.3 kn until 0830, then 072°T at 8.2 kn until 0855.

   Give the 0855 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 1010 you fix your position 233°T, 2.5 nm from Gannet Rock daybeacon. You steer 026°T at 4.7 kn until 1050, then 213°T at 4.9 kn until 1125.

   Give the 1125 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 0940 you fix your position 078°T, 2.2 nm from Tern Island tower. You steer 138°T at 9.2 kn until 0950, then 343°T at 4.0 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  

4. At 1405 you fix your position 097°T, 2.8 nm from Westfield church spire. You steer 054°T at 4.6 kn until 1450, then 221°T at 7.7 kn until 1515.

   Give the 1515 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  

5. At 1540 you fix your position 167°T, 1.4 nm from Gannet Rock daybeacon. You steer 048°T at 7.1 kn until 1555, then 347°T at 8.1 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  

6. At 0845 you fix your position 012°T, 2.2 nm from Heron Point Light. You steer 097°T at 7.9 kn until 0910, then 354°T at 4.4 kn until 0950.

   Give the 0950 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 1450 you fix your position 061°T, 2.5 nm from Westfield church spire. You steer 069°T at 5.8 kn until 1500, then 225°T at 8.5 kn until 1520.

   Give the 1520 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 1555 you fix your position 063°T, 1.8 nm from Heron Point Light. You steer 061°T at 6.1 kn until 1610, then 117°T at 4.9 kn until 1635.

   Give the 1635 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