29 to 88

Try this one. http://beta.ngs.noaa.gov/gtkweb/

Tom Adams, post: 372092, member: 7285 wrote: That is too profound....wow....now I have to rethink the answer to life, the universe, and everything.

So Long and thanks for all the fish

This is what I use

http://www.ngs.noaa.gov/cgi-bin/VERTCON/vert_con.prl

It will give you the computed difference between the datums, but what is normally needed in my area is the amount of subsidence from a previously published elevation.