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CORPSCON Version 6.0


Version 6.0, is a MS-Windows-based program which allows the user to convert coordinates between Geographic, State Plane, Universal Transverse Mercator (UTM) and US National Grid systems on the North American Datum of 1927 (NAD 27), the North American Datum of 1983 (NAD 83) and High Accuracy Reference Networks (HARNs). Corpscon uses the National Geodetic Survey (NGS) program Nadcon to convert between NAD 27, NAD 83 and HARNs. Corpscon, Version 6.0, performs vertical conversions to and from the National Geodetic Vertical Datum of 1929 (NGVD 29) and the North American Vertical Datum of 1988 (NAVD 88). Vertical conversions are based on the NGS program Vertcon and can be performed for the continental U.S. only. Corpscon, Version 6.0, will also calculate geoid-ellipsoid separations based on the NGS program GeoidXX (XX = 90, 93, 96, 99, and 03). Geoid-ellipsoid separations can be calculated for the Continental U.S., Alaska, Hawaii and Puerto Rico/U.S. Virgin Islands.

Corpscon and Geoid09

Instructions on the use of Geoid09 with Corpscon - click here

Disclaimer and Use Statement : The United States Government (the Government) furnishes these computer programs (along with any associated documentation) and the recipient accepts and uses them with the express understanding that the Government makes no warranties, expressed, or implied, concerning the accuracy, completeness, reliability, usability, or suitability for any particular purpose of the information and programs furnished.

The United States shall be under no liability whatsoever to any person or organization by reason of any use made thereof. These programs belong to the Government. Therefore, the recipient further agrees not to represent these programs to anyone as other than Government programs.

The recipient may not transfer these programs to others without also transferring this disclaimer.

Changes between Version 5.x and 6.x

There were several changes made to the Version 6.x of Corpscon to allow flexibility for new and future Geoid models, Nadcon files, and Vertcon files. A summary of changes are as follows:Corpscon view

- Selection of Geoid model used for conversion (90, 93, 96, 99, and 03)
- Selection of custom Vertcon or Geoid files (if available)
- Conversion to/from National Grid Reference System (NGRS)
- Increased number of fields for User Defined files
- Accuracy statement of conversions
- Redesigned interface
- Help for selecting correct State Plane and UTM zones
- dll for inclusion in other software
- Improved documentation and user’s manual

Version 5.x is still available by clicking here



- CORSPCON 6.0 provides an erroneous Combined Scale Factor. CORPSCON 6.x does not convert coordinates from USNG to Geodetic correctly. NGS's online version at should be used for this.

New Excel version of Corpscon (1 Apr 10)
Now available - Beta version of Corpscon that runs inside of Excel. Paste your input data to the input worksheet, identify your conversion preferences in the setup worksheet, and your output is stored on the output worksheet ready for additional calculations using the Excel built-in functions. Caution - This version has not been tested and may produce erroneous results.

Downloading and Installing Corpscon 6.x



Corpscon 6.0 has been tested on a 166MHz, Pentium machine running Windows98SE with 64 MB of RAM and a screen area of 800x600 pixels. Corpscon 6.0 should run on Windows95, but it has not been tested with this operating system. Corpscon will not run on any 16-bit versions of Windows (Windows 3.1 or below), and will not run under DOS.


Vista users may have to be logged on as an administrator.
Another setting that may be required with Vista:

- Right click on the downloaded .exe file
- Cick on properties
- Click on the compatibility tab
- Set compatibility to Windows XP SP2

Windows 7:

Windows 7 users have had success by:

- Right click on the Corpscon.exe file
- Cick on "Troubleshoot Compatibility"
- Click on "Try Recommended Settings"
- Click in "Start the Program"



Contact Us
Due to restricted resources, very limited assistance is available to non-Corps of Engineers users. AGC will maintain this web site and update the Frequently Asked Questions page. Please exhaust these web resources and the CORPSCON help files, before e-mailing the Point of Contact. AGC will provide assistance, where possible, although response to inquiries is not guaranteed.

The POC for this page:
Corpscon POC