Garmin 640 Guida Utente

Appendix

within safe depth—(BlueChart g2 Vision) auto-guidance cannot 

calculate the route; travel to water within the specified safe depth.
auto-guidance unable to calculate route, please shorten route—

(BlueChart g2 Vision) auto-guidance cannot calculate the route; 

choose a closer end point.
Battery alarm—a user-set battery alarm has sounded.
Boat is not Moving Fast enough to Calibrate—(speed sensor) 

appears during water speed calibration. Check the speed wheel for 

blockage and calibrate again. If the wheel is clear, calibrate again 

and increase speed.
Calibration is complete—touchscreen calibration successful.
Can’t read user Card—cannot read card when attempting a user 

data transfer.
Can’t read Voltages that High, Limited to top of range—

entering a battery alarm voltage higher than the unit can read.
Can’t read Voltages that Low, Limited to Bottom of range—

entering a battery alarm voltage lower than the unit can read.

Can’t unlock Maps—maps are locked and cannot be used on this 

unit.
Can’t Write user Card— cannot write card when attempting a 

user data transfer.
Cartography Service incompatible. Software update 

required—a software update is needed. Contact product support 

for assistance updating your unit software.
Check XM antenna—XM antenna is not connected. Check 

connectivity.
Cooling Fan Voltage too High—the unit cooling fan voltage is 

higher than expected. Contact product support.
Cooling Fan Voltage too Low—the unit cooling fan voltage is 

lower than expected. Contact product support.
Database error—general database error. Contact product support.
Deep Water alarm—(sonar) the boat has entered the user-defined 

value for deep water.
Directory item With this MMSi already exists—MMSI unit is 

already in the directory.