Furuno GP-320B - Manual (Page 15)

7
4. TROUBLESHOOTING, BATTERY
Troubleshooting
If the message “No position data” appears on the display of NavNet equipment, there may
be a problem with the GPS receiver. Turn off the power and then check the following points:
1) Check for objects around the antenna which may interfere with reception.
2) Check that the antenna cable is firmly fastened.
3) If extension cable(s) are used, check for water leakage at junction point(s).
4) Check the antenna cable for damage.
5) Check the antenna for damage.
If the problem seems to be with the antenna cable or antenna, contact your dealer.
Battery
The antenna unit contains a lithium battery which preserves data when the power is turned
off, and its life is approximately 20 years (operating rate 70%) for large vessels and 10
years (operating rate 20%) for small vessels. The equipment can be used when the voltage
of the battery is low, however data is not backed up and the unit starts up in the “cold start”
condition.