Standard Horizon HX850S Owner's Manual page 19

[ CALL ( ENT ) MENU ] KEY
Press this key to access the DSC Call Menu. The "Individual Call",
"Group Call", "All Ships Call", "Position Request", "Position Report",
"DSC Log", and "DSC Test" functions can be accessed from the DSC
Call Menu.
Secondary use:
Press and hold this key to access the "Radio Setup", "DSC Setup" or
"GPS Setup" menu.
TX/BUSY Indicator
This indicator glows green when a signal is being received and red when
transmitting.
When the Emergency feature is activated, this indicator blinks the interna-
tionally-recognized Morse Code "S.O.S" message.
Microphone
The internal microphone is located here.
Speaker
The internal speaker is located here.
NMEA Terminals ( Bottom side )
Connect this NMEA input/output terminal to the GPS or Chart Plotter via
the CD-38 Charger Cradle. Keep these terminals clean.
Battery Pack Lock ( Bottom side )
Turn the Battery Pack Lock to the "OPEN" position for battery removal.
HX850S Page 19