Anecdotal, but I had a call from an irate lawyer a few months ago who had discovered that the VOIP phones in his office were pinging an address in China. We wiped the phones and moved them to secure transport. It apparently hasn't happened again. But our addiction to cheap components and just making everything run Linux so we can solve our problems in high-level languages make this kind of thing unavoidable.
One wonders why the boats have unrestricted Internet access in the first place and whether whatever network they connect to even has open routes to China.