Garmin G300 Pilot's Manual page 208

integrated autopilot
CHANGING THE ALTITUDE REFERENCE
When operating in Altitude Hold Mode, the Altitude Reference can be
adjusted in the following ways:
• The Altitude Reference can be adjusted up or down in 10-foot
increments by pressing the FMS Joystick up or down. Using this
method, up to 200 feet of altitude change can be commanded.
To change the Altitude Reference by more the 200 feet, use the
CWS button as described below, or climb/descend using another
vertical mode (PIT, VS) to capture the desired Selected Altitude.
• Pressing the CWS Button allows the aircraft to be hand-flown to a
new Altitude Reference. When the CWS Button is released at the
desired altitude, the new altitude is established as the Altitude
Reference.
nOte: While operating in Altitude Hold Mode, using the FMS Joystick to
change the Selected Altitude does not change the Altitude Reference, and
does not cancel the mode.
190
Altitude Hold
Mode Active
Altitude Hold Mode
Garmin G300 Pilot's Guide
Altitude
Reference
Altitude Hold Mode Softkey
Selected
Altitude
190-00921-00 Rev. D