Garmin 521s 用户指南

Configuring the Chartplotter

  To set a system alarm from the Home screen, select 

 > 

 > 

.

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.

  To set a sonar alarm from the Home screen, select 

 > 

 > 

.

  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.

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 

temperature.
fish—set an alarm to sound when the unit detects a suspended 

target of the specified symbols.

—sounds an alarm for all fish sizes.

—sounds an alarm for medium and large fish only.

—sounds an alarm for large fish only.

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.

1.  From the Home screen, select 

 > 

 > 

 > 

 > 

 (or 

).

2.  If you select 

On, use the 

 to indicate the fuel level at 

which the alarm should sound.