Garmin GPSMAP 420s Owner's Manual - Page 63
Alarms and Messages, Sonar
UPC - 753759065799
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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) 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. 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 userset 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. GPSMAP 400/500 Series Owner's Manual Appendix 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. 57