The Working Units and Levels preferences offer two reference levels in addition to project zero. It is common to set one of these levels to sea level. (We don't use the other one for anything at this time.)
With sea level set correctly, you can build your site model mesh using sea level topo data. Level dimension texts have autotext elements that can refer to sea level. Our standard story level markers and elevation marker objects can refer to sea level or project zero.
Reference levels are set in the Working Units and Levels preferences dialog.
Leave the 'relative to' marker on project zero. The sea level value is the elevation of project zero in the real world, which is usually the finish floor of the main story of the building. This value needs to be entered as a negative number, because it is below project zero. If you change the actual elevation of the project, you need to recalculate the sea level value and change it.
Sea level and the second reference level are only for display and input assistance. Elements are always placed relative to their stories and project zero. If you change sea level, you don't have to worry about your site mesh moving around, even if you used sea level values to set it up.
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