{"version":"1.0","type":"link","title":"Chart datum - Newikis","description":"A chart datum is the water surface serving as origin (or coordinate surface) of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. Common chart datums are…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/f/ff/Diagram_of_United_States_Tidal_Datums_and_Marine_Legal_Areas.svg/1280px-Diagram_of_United_States_Tidal_Datums_and_Marine_Legal_Areas.svg.png","thumbnail_width":1280,"thumbnail_height":921}