jmarkb wrote:..except if it is windy, foggy or dark!
Why would it not work if it is foggy or dark? If you know the location of the person in distress, you can try and locate them no matter what the visibility. They will try to get to them on foot and have to find them currently, looks like the jet suit has the potential to do that an awful lot quicker, at the very least in weather conditions that aren't too bad for it to be usable.
High winds might be a problem, but just because something isn't 100% perfect, doesn't make it useless so shouldn't be discarded on that basis.