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Surveys between bench marks will often close better
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NAVD 88 has provided a better reference to compute
GPS-Derived
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Orthometric Heights
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40,000 Additional bench marks of First-Order
accuracy is available on
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NAVD 88
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Data and NAVD 88 adjusted height values is readily
available and
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accessible in a convenient format from NGS’s web
site:
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http://www.ngs.noaa.gov
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Federal Surveying and Mapping agencies will stop
publishing on
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NGVD 29 and will publish only on NAVD 88
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Surveys performed for the Federal Government
requires the use of
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NAVD 88
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