Question: is navd88 mean sea level?
Answer: NGVD 29 (sometimes incorrectly referred to as Mean Sea Level) started out being named the Sea Level Datum of 1929 and was based on fixed Mean Sea Level at 26 tide gauges in the U.S. and Canada. ... NAVD88 was affirmed as the official civilian vertical datum for the United States by a notice in the Federal Register (Vol.