Worksheet 9 · 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 1340 you fix your position 133°T, 1.6 nm from Westfield church spire. You steer 151°T at 6.4 kn until 1355, then 065°T at 4.0 kn until 1430.

   Give the 1430 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  

2. At 1205 you fix your position 344°T, 1.4 nm from Heron Point Light. You steer 008°T at 9.9 kn until 1220, then 216°T at 5.9 kn until 1240.

   Give the 1240 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 1500 you fix your position 042°T, 3.5 nm from Gannet Rock daybeacon. You steer 201°T at 9.3 kn until 1525, then 032°T at 9.5 kn until 1550.

   Give the 1550 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 0815 you fix your position 262°T, 3.7 nm from Tern Island tower. You steer 033°T at 4.7 kn until 0840, then 175°T at 4.0 kn until 0850.

   Give the 0850 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 1430 you fix your position 044°T, 2.4 nm from Tern Island tower. You steer 171°T at 5.6 kn until 1450, then 131°T at 9.4 kn until 1505.

   Give the 1505 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 1050 you fix your position 037°T, 4.4 nm from Westfield church spire. You steer 178°T at 9.3 kn until 1115, then 253°T at 5.4 kn until 1130.

   Give the 1130 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 0855 you fix your position 160°T, 1.7 nm from Westfield church spire. You steer 116°T at 4.6 kn until 0935, then 354°T at 7.9 kn until 1020.

   Give the 1020 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 1030 you fix your position 221°T, 3.3 nm from Tern Island tower. You steer 255°T at 6.8 kn until 1100, then 049°T at 6.3 kn until 1140.

   Give the 1140 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