The Inverse tab dialog is split in half with the Source settings on the left side and the Destination settings on the right side.
Using the drop down boxes, select the column name that relates to the appropriate data type. The Calculator will label the text box according to which coordinate systems have been set in the Point Database Conversions tab. The conversion will be calculated using either Geodetic or Rhumb Line which can be set in Preferences.
For example, if the user is converting geodetic points (Lat/Long), the text boxes will indicate "Latitude" and "Longitude". For grid (UTM, State Plane, etc) the labels will indicate "North/South" and "East/West" where appropriate. This is true for both the Source and Destination sides of the dialog.
Inverse Settings
Input
The Point File Inverse tab is set up a slightly different than the Convert and Forward tabs. The Source side has drop down boxes for two coordinates. This is because in order to perform an Inverse calculation, there must be two known points for the calculations.
The Use Input Point From Next Row toggle instructs the Calculator to take the value in the next row (row below) and calculate the inverse (as opposed to using values in another column).
Output
The results of an Inverse calculation are:
Geodetic/Grid Distance between the 2 points,
Geodetic/Grid Azimuth Ahead (Point. A to Point. B), and
Geodetic/Grid Azimuth Back (Point B to Point A).
A CCG string for the destination point relative to the starting point.
The user may assign each result to a column using the drop down boxes. Specify (none) if a calculation is not needed.
For example, you may only need the Geodetic Distance and Geodetic Azimuth Ahead for a series of points. Using the drop down boxes you would assign those results to their appropriate columns. You would select (none) for the remaining boxes.
Units
Click on the appropriate buttons to specify the Output Distance units and Azimuth (angular) units.