Raymarine axiom pro 9 RVX Installation Instructions Manual page 139

No sonar source available
If the 'No sonar source available' warning is displayed then either:
• your sonar module is still powering up.
• your MFD cannot establish a connection with your external Sonar
module
• your Internal Sonar module has no transducer connected.
Check your external sonar module's network and power connection,
check your MFD's network or transducer connection ensuring the
connections and cabling is correct and free from damage, then
power cycle your system. If the Sonar module is still not found then
refer to your equipment's installation documentation for further
troubleshooting information.
No transducer connected
If the 'No transducer connected' warning is displayed then your Sonar
module cannot connect to your transducer.
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