Do I need DGPS to calibrate?

Yes, you will need a differential GPS (DGPS) position to perform the series of calibration steps. When you have a DGPS position:

• The antenna LED is green
• You will be able to perform the calibration, meaning, Whirl will display the first step of Calibration A after you enter vehicle dimensions; otherwise, if you don't have a DGPS signal, Whirl will display the Error Status screen with a GPS Error section (to help you troubleshoot the error)
• On the Wheelman screen or the map screen, green bars and 'GNSS' appear at the top
  
• The Wheelman dashboard GNSS LED (circled below) is solid on (red)