The MSS Tide values are relative to Mean Sea Surface.
This calculation uses the Doodson Filter to de-tide the Antenna Height and provide the MSS estimate.
The Geoid Tide values are relative to the selected Geoid Model, approximating MSL.
This calculation uses the Geoid Model, the Ellipsoid Height and the User entered antenna height to determine the tide values relative to the Geiod Model selected (selected in Config- Calculation- Settings...).
The Geiod Tide is available within 1 hours of starting whereas the MSS tide is available after 39 hours.
Note: the ‘vertical bias’ between MSS Tide and Geoid Tide is included in the TideInfo.txt file.