Setting The Total Fuel Onboard Alarm - Garmin GPSMAP 420 Owner's Manual

Setting System Alarms
To set a system alarm from the Home screen, select
Alarms > System.
Clock—set an alarm using the system (GPS) clock. The unit must
be on for the clock alarm to work.
battery—set an alarm to sound when the battery reaches a specified
low voltage.
gPS accuracy—set an alarm to sound when the GPS location
accuracy falls outside the specified value.
Setting Sonar Alarms
To set a sonar alarm from the Home screen, select
Alarms > Sonar.
NOTE: You must be receiving NMEA sonar depth data or using a
Garmin sounder module to configure sonar alarms.
Shallow water—set an alarm to sound when the depth is less than
the specified value.
deep water—set an alarm to sound when the depth is greater than
the specified value.
GPSMAP 400/500 Series Owner's Manual
water Temp—set an alarm to sound when the transducer reports
a temperature that is 2°F (1.1°C) above or below the specified
Configure >
temperature.
fish—set an alarm to sound when the unit detects a suspended
target of the specified symbols.

Setting the Total Fuel Onboard Alarm

Configure >
You can configure your chartplotter to sound an alarm when the total
amount of remaining onboard fuel reaches the specified level.
NOTE: To receive fuel-level information, your unit must be
connected to an external fuel sensor, such as the Garmin GFS 10.
To enable the Total Fuel Onboard alarm and set the fuel
alarm level:
1. From the Home screen, select
Total Onboard
2. If you select On, use the
which the alarm should sound.
Configuring the Chartplotter
—sounds an alarm for all fish sizes.
—sounds an alarm for medium and large fish only.
—sounds an alarm for large fish only.
Configure >
> On (or Off).
Rocker
to indicate the fuel level at
Alarms > Fuel >
4