EV-1 heading sensor
You can connect an EV-1 heading sensor to your display, this will ensure that accurate heading data is available, regardless of vessel movement.
The EV-1 heading sensor will automatically calibrate (linearize) itself while the following conditions are met:
vessel speed is between 3 to 15 knots, and
at least a 270° turn has been made.
The time it takes for automatic calibration can be reduced by completing a full 360° turn at between 3 to 15 knots.
After the initial calibration has been completed a notification will be displayed and a Max deviation value will be reported in the EVO COMPASS section of the This display menu. If dashes are displayed then the calibration has not been successful.
If the Maximum deviation is 45° or greater, it is recommended that either the EV-1 is relocated, in a location with less magnetic interference, or that any devices causing magnetic interference are moved farther away from the EV-1.