Worksheet 115 · 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 1435 you fix your position 359°T, 2.1 nm from Heron Point Light. You steer 090°T at 9.3 kn until 1510, then 219°T at 7.5 kn until 1520.

   Give the 1520 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 1340 you fix your position 029°T, 3.0 nm from Heron Point Light. You steer 262°T at 5.1 kn until 1405, then 020°T at 7.3 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  

3. At 0750 you fix your position 323°T, 2.6 nm from Tern Island tower. You steer 218°T at 8.4 kn until 0820, then 174°T at 8.6 kn until 0845.

   Give the 0845 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 1450 you fix your position 035°T, 2.9 nm from Heron Point Light. You steer 004°T at 5.3 kn until 1500, then 056°T at 6.9 kn until 1515.

   Give the 1515 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 1420 you fix your position 261°T, 3.4 nm from Tern Island tower. You steer 188°T at 4.6 kn until 1440, then 320°T at 4.4 kn until 1515.

   Give the 1515 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  

6. At 1345 you fix your position 234°T, 1.7 nm from Tern Island tower. You steer 301°T at 5.1 kn until 1420, then 155°T at 7.4 kn until 1500.

   Give the 1500 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  

7. At 1005 you fix your position 062°T, 4.3 nm from Tern Island tower. You steer 190°T at 4.7 kn until 1035, then 238°T at 7.3 kn until 1105.

   Give the 1105 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  

8. At 1600 you fix your position 175°T, 1.4 nm from Tern Island tower. You steer 138°T at 7.7 kn until 1625, then 040°T at 5.0 kn until 1655.

   Give the 1655 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