It is recommended that you use the new Geoid 2012 Revision A from NGS if you are working in the United States. The Geoid12A model is intended to transform between NAD 83 (2011/PA11/MA11) and the respective vertical datums for the different regions, including NAVD88, GUVD04, ASVD02, NMVD03, PRVD02 and VIVD09. For more information visit - http://www.ngs.noaa.gov/GEOID/GEOID12A/
For Leica users you will find the new Geoid12A at the link below:
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