Raymarine GPM400 Reference Manual page 88

• sounds the waypoint arrival alarm
• displays the Pilot Control screen with 'Last Waypoint' in the
Next Waypoint field.
The toolbar gives you three options:
Press CLEAR ALARM to silence the alarm and keep the autopilot
engaged in auto mode, continuing on the current heading.
Press STANDBY to silence the alarm and disengage the autopilot.
Press AUTO to silence the alarm and continue on the current
locked heading with autopilot engaged.
G-Series Reference Manual 88