I'll guess you have G2 or G3 SOLIX or APEX units since you are looking for the 360 icon at the top right of the display.
Disconnect the MEGA 360 and turn off or disconnect Ethernet.
Do a Restore Factory Defaults, go through the new unit setup, and turn the unit off.
Reconnect just the MEGA 360 and start the unit up. WAIT for the MEGA 360 to be recognized, may take a few minutes.
It will be listed in the Sonar Source menu AFTER it is recognized.
![[Linked Image]](https://i.postimg.cc/7hs6SGBx/snp0907210821.png)