Worksheet 640 · 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 1545 you fix your position 079°T, 2.4 nm from Heron Point Light. You steer 014°T at 6.4 kn until 1600, then 317°T at 5.4 kn until 1630.

   Give the 1630 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  

2. At 1505 you fix your position 044°T, 3.8 nm from Gannet Rock daybeacon. You steer 263°T at 8.9 kn until 1520, then 020°T at 9.9 kn until 1530.

   Give the 1530 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 1415 you fix your position 055°T, 1.7 nm from Tern Island tower. You steer 345°T at 4.2 kn until 1430, then 131°T at 8.3 kn until 1500.

   Give the 1500 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 1135 you fix your position 293°T, 3.8 nm from Tern Island tower. You steer 193°T at 7.6 kn until 1200, then 238°T at 8.0 kn until 1215.

   Give the 1215 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 0855 you fix your position 154°T, 2.6 nm from Tern Island tower. You steer 206°T at 4.5 kn until 0925, then 267°T at 6.0 kn until 0940.

   Give the 0940 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 0905 you fix your position 026°T, 2.3 nm from Heron Point Light. You steer 120°T at 7.5 kn until 0930, then 046°T at 9.5 kn until 1015.

   Give the 1015 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 0725 you fix your position 061°T, 2.6 nm from Heron Point Light. You steer 272°T at 6.9 kn until 0750, then 113°T at 10.0 kn until 0815.

   Give the 0815 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  

8. At 1245 you fix your position 055°T, 2.6 nm from Gannet Rock daybeacon. You steer 001°T at 8.7 kn until 1300, then 053°T at 7.6 kn until 1310.

   Give the 1310 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