Garmin 521s Guida Utente

Appendix 

Power: 1 kW Transducer, 1,000 W (RMS), 

8,000 W (peak to peak)*; 

Dual Frequency, 500 W (RMS), 4,000 W (peak to peak)

frequency: 50/200 kHz (dual frequency and 1 kW)
depth: 2,500 ft. (762 m) (1 kW), 1,500 ft. (457 m)**
 

*1 kW transducers are supported by the GPSMAP 525s/526s/

555s/556s units only.

 

**Depth capacity is dependent on water salinity, bottom type, 

and other water conditions.

The unit uses an on-screen message system to alert you to unit 

operating characteristics. When a message appears, press 

 to 

acknowledge the message.
accuracy alarm—the GPS accuracy has fallen outside of the user-

set value.
aiS: dangerous Target—shows the MMSI (Maritime Mobile 

Service Identity) of the dangerous target.
alarm Clock—the alarm clock has sounded.
anchor drag alarm—you have drifted out of the specified distance 

range.

antenna input is Shorted—a part of the antenna wiring is crimped, 

broken, or contacting the chassis.
arriving at [waypoint Name]—you arrived at the destination 

waypoint. You can Stop Navigation when this message appears.
battery alarm—battery voltage has fallen below the value entered 

in the Battery Alarm setup.
battery Voltage is Too High—too much input voltage—the unit 

shuts off in 10 seconds. Decrease the input voltage to the maximum 

voltage allowed (or less) for your chartplotter.
boat is Not Moving fast Enough to Calibrate—the boat is not 

moving fast enough for the speed wheel to provide a valid speed.
Can’t Read User Card—error reading card; remove and reinsert. 

Contact your dealer or Garmin Product Support if the problem 

persists. 
Can’t Read Voltages That High, Limited To Top Of Range—the 

voltage value in the Battery Alarm setup is higher than the unit can 

read.