Humminbird 785C2I - Manual (Page 101)

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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).
Demonstration
Demonstration deactivates the Demonstration Mode
feature (see Powering Up the Unit).
To turn Demonstration on or off:
1. Highlight Demonstration on the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to turn
Demonstration On or Off (Off, On, Default = On).