20 •
••
• Navigation Tasks
Positioning
Positioning means all available methods to calculate and keep updated ship´s position during a voyage.
The calculation of ship´s position is based on available navigation sensors. The system integrates valid information
from different sensors and uses the Kalman filter technology for final position calculation.
Positioning
Manual
correction
Reference
targets
Direct
positioning
sensors
Dead reck.
equipment
Direct Positioning sensors
a) Radio navigation equipment:
• Decca navigator
• Loran-C navigator
• Syledis navigator
• Local position fixing systems
Radio navigation devices supplies continuous position but are not typically available world wide.
b) Satellite navigation systems:
• GPS navigator
• GPS navigator with a differential correction facility, DGPS
Dead Reckoning equipment
a) Ship´s heading measurement devices:
• Gyro compass
• Magnetic compass
• GPS gyro compass
b) Speed measuring devices:
• Single axis speed logs
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