2.3
Positioning
Positioning means using all available methods available to calculate and keep ship's position up-to-date 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.
Direct
positioning
sensors
Positioning
Manual
correction
2.3.1
Direct positioning sensors
Radio navigation equipment:
• Decca navigator
• Loran-C navigator
• SYLEDIS navigator
• Local position-fixing systems
2.3.2
Dead reckoning equipment
Ship's heading measurement devices:
• Gyrocompass
• Magnetic compass
• GPS gyrocompass
2.3.3
Manual correction
User-executed position correction where radar echoes and information from synthetic charts are combined and
verified by the operator, and adjusted if necessary.
Dead reck.
equipment
Satellitenavigation systems:
• GPS navigator
• GPS navigator with a differential correction, DGPS
Speed measuring devices:
• Single-axis speed logs
• Dual-axis speed logs
• Radionavigation equipment
• Satellitenavigation equipment
2. Navigation Tasks
2-3