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The reason you need a Sirius ready radio is so the radio itself can interface with the LWX-1 antenna for changing channels. Without an interface, just hooking up to the aux jack would not work
Wrong! A sirius ready radio is only needed if you are buying a sirius module to interface into the radio. If you want Sirius radio in your boat without a LWX-1 then you would need a sirius ready radio or you could have a seperate sirius display and then hook the audio out to the radio.
With the LWX-1 the HDS unit is the interface. The LWX-1 can not interface to anything but a HDS unit(ethernet cable). The audio output from the LWX-1 module is a 3.5mm cable. Which most radios have a 3.5mm aux input on them. If not they make special cables for the radio for example RCA aux input then you will just need an adapter from 3.5mm to RCA.