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24 · 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
Radio navigation equipment: Satellite navigation systems:
Decca navigator GPS navigator
Loran-C navigator GPS navigator with a differential correction, DGPS
Syledis navigator
Local position fixing systems
Dead Reckoning equipment
Ship´s heading measurement devices: Speed measuring devices:
Gyro compass Single axis speed logs
Magnetic compass Dual axis speed logs
GPS gyro compass Radio navigation equipment
Satellite navigation equipment
Reference Targets
Ship position calculation based on selected radar object called Reference Target. Selection of radar objects is
carried out in chart planning phase.
Manual Correction
User activated position correction where radar echoes and information of synthetic chart are combined and verified
by operator, and adjusted if necessary.