The sonar can be set to broadcast any or all data.
The Subnet determines the address format.
With a default Subnet of 255.0.0.0, in Network settings, the IP for the data that is to be sent to more than one computer would have an IP 10.255.255.255.
The various data output are Bathy, TruePix/Snippets and Water Column, so you would enter 10.255.255.255 as the IP for any of those data which is to be sent to more than one computer.