Hover in fog? I don't think so. Unless there's an autopilot hover mode coupled to a GPS, you have to be able to see the ground to hover.
If my helo knowledge is out of date, somebody please correct me.
I understand most IFR rated Helos have autopilots that can hover. Another pilot board was saying that it's very common to have commercial helo pilots with IFR ratings but they don't maintain the currency in the rating and the outcome often looks like this and the mishap in NYC last year but I'm not a helo guy.
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