what does above chart datum mean. It is also the plane to which all tidal heights are referred, so. What does “above chart datum” mean?
what does above chart datum mean As ordnance datum is generally above chart datum, the numbers on a tide table when given to od are usually lower than when given to chart. Chart datum is the most common datum for tide tables, although for engineering purposes, ordnance datum is more common as it is. The phrase “above chart datum” is often used in reference to predicted tide heights.
The Phrase “Above Chart Datum” Is Often Used In Reference To Predicted Tide Heights.
Chart datum is the plane below which all depths are published on a navigational chart. It is also the plane to which all tidal heights are referred, so. Chart datum is marked on the diagram below as a purple dotted line and as you can see it is used both:
What Does “Above Chart Datum” Mean?
What does above chart datum mean? When something is described as being “above chart datum,” it means that its elevation or height is measured relative to the chart. As ordnance datum is generally above chart datum, the numbers on a tide table when given to od are usually lower than when given to chart.