Chart datum
Chart datum
Level of water from which depths displayed on a nautical chart are measured.
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Readers' pathsAug 2026 – Oct 2026
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Tide
Change in sea level due to gravity.
41%
Geodetic datum
Reference frame for measuring location.
12%
Vertical datum
Reference surface for vertical positions.
7.8%
Sea level
Geographical reference point from which various heights are measured.
6.8%
Nautical chart
Topographic map of a maritime area and adjacent coastal regions.
5.4%
Baltic Sea
Sea in northern Europe.
4.9%
Lunar node
Intersection of Moon's orbit with Earth's ecliptic.
4.9%
Readers come from
Share of the 917 readers arriving from another article
Brooklyn Bridge
Bridge in New York City.
34%
Tide
Change in sea level due to gravity.
23%
Coastline paradox
Counterintuitive observation.
12%
Sea level
Geographical reference point from which various heights are measured.
8.8%
Holland Tunnel
Tunnel between New Jersey and New York.
8.8%
Tidal range
Vertical difference between the high tide and the succeeding low tide.
5.5%
Air draft
Distance from water to the highest point on a vessel or lowest point on a bridge span.
5.1%
High water mark
Highest level of a body of water.
2.4%
Ordnance datum
Vertical datum used as the basis for deriving altitudes on maps.
1.1%