Appendix
Alarms and Messages
The Fishfinder 400C uses an on-screen message system to alert you to unit operating characteristics. When a message appears, press SELECT to acknowledge the message and return to the screen you were viewing.
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.
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 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 ofRange—the voltage value in the Battery Alarm setup is lower than the voltage where the unit automatically turns off.
Deep Water Alarm—the Deep Water Alarm depth has been reached.
Drift Alarm—the depth has changed by the amount of the Drift Alarm value.
Fish Alarm—an icon appears and a beep sounds (if enabled) when a fish is detected. This alarm does not show a message banner.
Shallow Water Alarm—the Shallow Water Alarm depth has been reached.
Simulating Operation—the unit is in Simulator Mode.
Sonar Failed, Unit Needs Repair—there is an internal problem with the fishfinder. Contact your dealer or Garmin Product Support to have the unit serviced.
Transducer Disconnected, Sonar Turned Off—there is not a transducer attached, bad cable/transducer, or the transducer cable was disconnected. If the transducer cable is removed while the unit is on, reconnect and cycle power.
Water Speed Sensor Is Not Working—the speed sensor is not detected. Check the connections.
Entering (Leaving) target water temperature—the target water temperature is 2° F (1.1° C) above or below the temperature specified by the Water Temperature Alarm. These messages appear when you enter or leave that zone.
