Agreed, they are pretty good these days, but as I said, not 100% reliable, even 22s and 23s. That said, I understand there are procedures in place to mitigate against exactly this occurrence on the 42s. And if the plot slippage is a known problem, maybe a more prudent MLA could be applied - just a thought.
Still, its only a machine, and wether the SAR boys had any effect on procedings or not, the main thing is that the 3 crew are OK