![]() By clicking the "Select." button you can access the list of geoid definitions currently used in the software. To open the "Manage Geoids" window, select the "Preferences" option from the "Options" menu, and select the "RTK" tab. To access the "\ProgramData\Hydromagic\" folder, please select the "Open Program Data Folder." option from the "Help" menu. The geoid files have the file extension ".geo" and are stored in the "\ProgramData\Hydromagic\Geoids\" folder on your hard drive. Each geoid model is in fact a simple binary file containing separation values in a regularly spaced grid. In Eye4Software Hydromagic Survey or Dredging, a geoid model is used to calculate the separation between the local vertical datum and the WGS84 ellipsoidal height returned by the GPS or RTK receiver.
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