Humminbird 580 - Manual (Page 99)

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When navigating, the following NMEA sentences are also output when
NMEA Output is turned On:
APB - Autopilot Sentence B
BWR - Bearing and Distance to Waypoint
RMB - Recommended Minimum Navigation Info
To turn NMEA Output on or off:
1. Make sure you are in Advanced User Mode, then highlight NMEA
Output on the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the NMEA
Output to On or Off. (Off, On, Default = Off)
Sonar
Sonar deactivates Sonar and removes the Sonar
Views from the view rotation. (Off, On, Default = On)
To turn Sonar on or off:
1. Highlight Sonar on the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Sonar
to On or Off. (Off, On, Default = On)