Alarms And Messages - Garmin GPSMAP 420 Owner's Manual

Alarms and Messages

The unit uses an on-screen message system to alert you to unit
operating characteristics. When a message appears, press
acknowledge the message.
Accuracy Alarm—the GPS accuracy has fallen outside of 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—some part of the antenna wiring is
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 35-Volts or
less.
GPSMAP 400 Series Owner's Manual
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boat Is Not Moving Fast Enough to Calibrate—the boat is not
moving fast enough for the speed wheel to provide a valid speed.
MENU to
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.
Can't Read Voltages That Low, Limited To bottom Of
Range—voltage value in the Battery Alarm setup is lower than the
voltage where the unit automatically turns off.
Can't Unlock Maps—data on data card is not unlocked for the unit.
Contact your dealer or Garmin Product Support.
Can't Write User Card, Card May be Full—error reading card;
remove and reinsert. Contact your dealer or Garmin Product Support
if the problem persists.
Can't Write User Card, Card Is Read-Only—the SD card in your
unit contains data copy protection.
Check XM Antenna*—internal problem with your GXM 31
antenna. Contact Garmin Product Support.
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