Worksheet 368 · 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 1550 you fix your position 039°T, 2.4 nm from Westfield church spire. You steer 183°T at 8.7 kn until 1600, then 020°T at 9.6 kn until 1615.

   Give the 1615 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 0910 you fix your position 071°T, 2.4 nm from Westfield church spire. You steer 103°T at 7.5 kn until 0920, then 331°T at 6.7 kn until 0940.

   Give the 0940 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 1425 you fix your position 071°T, 2.9 nm from Westfield church spire. You steer 343°T at 4.0 kn until 1500, then 166°T at 8.3 kn until 1540.

   Give the 1540 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 1340 you fix your position 214°T, 3.0 nm from Tern Island tower. You steer 247°T at 4.8 kn until 1400, then 331°T at 6.6 kn until 1430.

   Give the 1430 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  

5. At 0925 you fix your position 223°T, 2.4 nm from Tern Island tower. You steer 128°T at 8.1 kn until 0945, then 091°T at 9.8 kn until 1000.

   Give the 1000 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 1435 you fix your position 357°T, 1.7 nm from Heron Point Light. You steer 308°T at 4.6 kn until 1455, then 062°T at 8.4 kn until 1535.

   Give the 1535 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 1555 you fix your position 284°T, 0.9 nm from Gannet Rock daybeacon. You steer 006°T at 4.0 kn until 1610, then 044°T at 5.5 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  

8. At 0705 you fix your position 067°T, 1.8 nm from Gannet Rock daybeacon. You steer 034°T at 5.7 kn until 0720, then 308°T at 7.7 kn until 0735.

   Give the 0735 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