2. Navigation Tasks
2-3
2.2.4 User chart planning
User chart planning consists of the following steps:
1. Create user navigation charts
2. Process chart alarms based on symbols, lines and areas of user chart
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.
Positioning
Manual
correction
Direct
positioning
sensors
Dead reck.
equipment
2.3.1 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
2.3.2 Dead reckoning equipment
Ship’s heading measurement devices: Speed measuring devices:
Gyrocompass Single-axis speed logs
Magnetic compass Dual-axis speed logs
GPS gyrocompass Radionavigation equipment
Satellite navigation equipment
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