Humminbird 778C - Manual (Page 89)

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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
Demonstration
Settings: Off, Visible; Default = Visible
Demonstration controls whether the Demonstration Mode is visible or off. The
Demonstration Mode appears on the screen if you don’t press any keys during
the warning screen at power up. Menu settings cannot be saved in
Demonstration (see Power On and Start-Up Options Menu).
Sound Control
Settings: No Sounds, Alarms Only, All Sounds; Default =
All Sounds
Sound Control allows you to set when the control head will beep or sound
because of key presses and/or alarms.
Setup Menu Tab