Thinking about this, as I sometimes think about the winter storm above tree-line scenario, I think of all the tools and resources one can call on during the situation. Which leads to a question:
if the wind whipping up the snow and causing white-out is from a consistent direction, does anyone ever use it as a navigational aid in itself? If it's a steady 315'er, for instance, it could be handy to maintain a certain bearing against it. No good if it's swirling, but might work sometimes, the thought goes.
The thing it's hard to keep in mind is that when it's white-out, you've got few to no visual cues. Better hope your compass is working!
I'd be interested, if it's not considered as veering too far off topic, to hear ppl's stories here of how they successfully got out of white-out conditions and safely onto followable trail sheltered by trees or terrain. Maybe it would be better to set that up as a separate thread, so it turns up in searches in the future.