Downloads - GEOID Models
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| Name | Size | Description | |
| TGO/TBC Geoid installation.doc | 43Kb | instructions for loading a new geoid model in Trimble Geomatics Office and Trimble Business Center |  |
| G09US.ggf | 34Mb | Geoid 2009 for the Continental US | |
| G09AK.ggf | 20Mb | Geoid 2009 for Alaska | |
| G09HW.ggf | 0.6Mb | Geoid 2009 for Hawaii | |
| G03US.ggf | 34Mb | Geoid 2003 for the Continental US - INCLUDES THE REGION 7 REVISION POST KATRINA | |
| EMG2008.GGF | 131Mb | Latest worldwide geoid model (2.5') | |