IGLD 1985 to be replaced by IGLD 2020. Tentative release 2025
Title pretty much says it all. See:
https://tidesandcurrents.noaa.gov/datum-updates/igld/
for details.
GIA impacts an important factor.
The site doesn??t have much additional content except this: https://tidesandcurrents.noaa.gov/datum-updates/assets/pdf/igld_2020_factsheet.pdf
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