If your stereo is connected to a NMEA 2000^® network with a device that provides speed information such as an engine, chartplotter, GPS antenna, water speed sensor, or wind speed sensor, you can set the stereo to adjust the volume automatically based on the selected speed source (Enabling Automatic Volume Adjustment Based on Speed).

For example, if a chartplotter with an internal GPS antenna or a stand-alone GPS antenna is on the same NMEA 2000 network as the stereo and you set the SPEED SOURCE to SPEED OVER GROUND, the volume increases as your speed increases.

For more information about connecting the stereo to a NMEA 2000 network, see the installation instructions for your stereo.