Chart Datum at ports and tide gauges
The new national Chart Datum is the Lowest Astronomical Tide (LAT), anchored at the UAE tide gauges and referenced to the UAE-NVD and the ellipsoid. Relate each port's legacy Chart Datum to the new one, and convert depths and heights between them.
Tide gauge
Convert a value
Datum relationship table
| Reference level | UAE-NVD (m) | Ellipsoid (m) | above old CD (m) | above new CD (m) |
|---|
Positive numbers are above the reference; the “old CD → new CD” shift a port must apply to charted depths is the difference of the two Chart Datum rows.