Simrad NAC-2 Commissioning Manual page 15

Failure to complete test will result in an alarm.
VRF calibration
Ú Note:
Only available if the rudder source is set to a virtual
rudder feedback.
VRF calibration determines the direction of rudder movement, the
minimum output required to move the rudder and the voltage to
rudder speed ratio.
To perform the VRF calibration you must be able to view the
movement of the rudder.
• Follow the on-screen guided steps until the VRF calibration is
completed.
Dockside setup | NAC-2/NAC-3 Commissioning Manual
15