You can winch on goggles but it's generally accepted that you provide a more accurate hover on white light than you do on NVG as they decrease the Field of View, significantly degrade depth perception and detection of small movements is more difficult. However, NVG can give very occasionally give a better hover on very calm nights when you are hovering on water references as they can 'see through' the goldfish bowl conditions and at least allow you to see a horizon. This is not necessarily an SOP though!