GPSMAP 400/500 Series Owner’s Manual 55
Appendix
waaS accuracy:
Position: <10 ft. (3 m), 95% typical*
Velocity: 0.05 m/sec steady state
dynamics: 6 g

Power

Power Source: 10–32 Vdc
GPSMAP 421/421s GPSMAP 451/451s
GPSMAP 521/521s GPSMAP 526/526s
GPSMAP 551/551s GPSMAP 556/556s
Power Source: 10–35 Vdc
GPSMAP 420/420s GPSMAP 450/450s
GPSMAP 520/520s GPSMAP 525/525s
GPSMAP 550/550s GPSMAP 555/555s
Usage: 15 W max at 13.8 Vdc
fuse: AGC/3AG - 3.0 A

Sonar

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);
Dual Beam, 400 W (RMS), 3,200 W (peak to peak)
frequency: 50/200 kHz (dual frequency and 1 kW), 80/200 kHz
(dual beam)
depth: 2,500 ft. (762 m) (1 kW), 1,500 ft. (457 m) (dual frequency),
900 ft (274 m) (dual beam)**
*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.
Alarms and Messages
The unit uses an on-screen message system to alert you to unit
operating characteristics. When a message appears, press MENU 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 specied distance
range.
antenna input is Shorted—a part of the antenna wiring is
contacting the chassis.