Worksheet 345 · 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 1415 you fix your position 105°T, 2.1 nm from Westfield church spire. You steer 078°T at 4.2 kn until 1450, then 338°T at 9.1 kn until 1500.

   Give the 1500 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 0720 you fix your position 087°T, 2.1 nm from Tern Island tower. You steer 167°T at 7.6 kn until 0735, then 080°T at 9.7 kn until 0750.

   Give the 0750 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 1530 you fix your position 205°T, 1.6 nm from Gannet Rock daybeacon. You steer 305°T at 6.1 kn until 1610, then 245°T at 8.6 kn until 1620.

   Give the 1620 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  

4. At 1355 you fix your position 236°T, 2.2 nm from Tern Island tower. You steer 201°T at 4.8 kn until 1430, then 291°T at 5.5 kn until 1440.

   Give the 1440 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 0700 you fix your position 025°T, 2.8 nm from Heron Point Light. You steer 088°T at 6.0 kn until 0720, then 260°T at 4.8 kn until 0750.

   Give the 0750 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  

6. At 1215 you fix your position 213°T, 2.1 nm from Tern Island tower. You steer 294°T at 5.4 kn until 1255, then 192°T at 6.0 kn until 1305.

   Give the 1305 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 1305 you fix your position 295°T, 3.2 nm from Tern Island tower. You steer 159°T at 9.5 kn until 1320, then 097°T at 6.5 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  

8. At 1040 you fix your position 189°T, 1.4 nm from Tern Island tower. You steer 242°T at 5.9 kn until 1050, then 296°T at 7.4 kn until 1105.

   Give the 1105 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