Simrad GO XSE Operator's Manual page 168

Detaching Sirius from the AUX source
If a Sirius radio is connected to the FUSION radio/server, the AUX
source is automatically attached to the Sirius feed. Sirius then
appears in the source list when the FUSION server is active.
To use the AUX source for a different device, the Sirius must be
detached from the AUX source.
Ú Note:
To use SiriusXM, an optional SiriusXM tuner must be
connected to the FUSION server.
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Audio | GO XSE Operator Manual