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I'm not sure to be honest, but I'll check next time I'm at the Montauk.

I'm getting used to the Simrad myself. I've always had older-gen MFDs, so while this new one is great, there's a lot more options to learn.

If you haven't done a ton of setup yet, it might be worth resetting the unit to factory defaults. It could be that it's set to use an external speaker with no actual speaker in place and connected. In my case, I found it odd that Whaler will install the NSX but I don't believe it's got an NMEA 2000 network because it doesn't show any engine data. For the time being I'm using the Smartcraft gauges and vessel view mobile until I get into the console and check out the wiring.