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Appendix
64 GPSMAP 400/500 Series Owner’s Manual
  
 431s/441s 
1 kW Transducer (536s/546s only), 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),
3200 W (peak to peak)

50/200 kHz (dual frequency and 1 kW), 80/200
kHz (dual beam)

2,500 ft� (762 m) (1 kW),
1,500 ft� (457 m) (dual frequency)
900 ft� (274 m) (dual beam)
Depth capacity is dependent on water salinity,
bottom type, and other water conditions�
531s/541s
536s/546s

The unit uses an on-screen message system to alert you to unit operating
characteristics. When a message appears, press to acknowledge the
message.
—the GPS accuracy has fallen outside of the user-set value.
—shows the MMSI (Maritime Mobile Service
Identity) of the dangerous target.
—the alarm clock has sounded.
—you have drifted out of the specied distance range.
—a part of the antenna wiring is crimped, broken,
or contacting the chassis.
—you arrived at the destination waypoint. You
can  when this message appears.
—battery voltage has fallen below the value entered in the
Battery Alarm setup.
—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.
—the boat is not moving fast
enough for the speed wheel to provide a valid speed.
—error reading card; remove and reinsert. Contact
your dealer or Garmin Product Support if the problem persists.
—the voltage
value in the Battery Alarm setup is higher than the unit can read.
—voltage
value in the Battery Alarm setup is lower than the voltage where the unit
automatically turns off.
—data on the data card is not unlocked for the unit.
Contact your dealer or Garmin Product Support.
—error reading card; remove
and reinsert. Contact your dealer or Garmin Product Support if the problem
persists.
—the SD card in your unit