Factsheets
GNSS and Chart Datum
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This factsheet provides guidance on the purpose and function of Global Navigation Satellite Systems (GNSS) and Chart Datum, and how they relate to nautical charts and navigational safety.
Positioning systems and the charts or maps used for navigation must operate using the same datum. Misalignment can result in significant positional errors. Hazards expected to be well clear may be directly ahead, or intended channels may be offset from the vessel’s track. Ensuring consistency between the satellite positioning system (for example, GPS) and the chart datum, or understanding and correcting any differences, is critical for safe navigation.
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