How to Perform Forward Calculations

A Forward calculation is used to compute a new coordinate that is a given distance and azimuth away from a starting coordinate. The conversion will be calculated using either Geodesic (Great Circle) or Rhumb Line (Constant Azimuth). To complete a Forward calculation, you must have:

A starting coordinate in a known coordinate system
Destination coordinate system (on the same Datum as the starting coordinate)
Distance and Azimuth ahead from the starting coordinate

Note: For both Forward and Inverse conversions, the distance specified is the distance along the surface of the datum. Even if you enter in an elevation value, the distances will be interpreted as being on the datum. This is also true for Geocentric coordinate systems that are 3 dimensional by nature. 3D Cartesian coordinates will be reduced to the surface of the datum.

To calculate a forward coordinate between any two coordinate systems on the same Datum:

At the bottom of the Interactive Job, select the Forward radio button.
Determine which of the two sides of the Geographic Calculator main window will be the input side.
Select a coordinate system for the input coordinate (starting location).
Use the Format button to select the display format for your input coordinates. This is very important for angular units.
Select a coordinate system for the output coordinate (ending location).
Use the Format button to select the display format for your output coordinates. This is very important for angular units.
Enter the input coordinate (starting location) into the appropriate Coordinate Point fields on the input side.
Select a method for calculating the Azimuth and distance, Geodesic, Rhumb Line, Grid, or CCG.
Specify the Forward azimuth and distance. You may specify different Angular and Linear units by clicking on the appropriate buttons next to each field and using the picker to chose a different unit.
Ensure that the calculation direction button has the red arrows pointing from the input side to the output side. To change the direction of the calculation, click the button.
Click the Calculate button. The output coordinate (ending location) will be displayed on the output side of the Interactive conversions tab.