[el_isma]

Not trying to troll, but... What happens if/when global warming makes sea level rise? Do we have measurements that are still based on "sea level"?

[_whiteCaps_]

https://tidesandcurrents.noaa.gov/sltrends/faq.html

> Tidal datums must be updated at least every 20-25 years due to global sea level rise. Some stations are more frequently updated due to high relative sea level trends.