To the best of my knowledge*, these are the only places in the world offering natural navigation training. This is a directory, not endorsement.
UK
The Natural Navigator, West Sussex
Original Outdoors, North Wales
Wild in the City, London
Woodcraft School, West Sussex
Intrepid Scotland, Scotland
Polaris Bushcraft, Hertfordshire
Howl Bushcraft, Yorkshire
Wild Harvest, Yorkshire
Survival Wisdom, Cornwall
International
Natural Awareness Tracking School, Virginia, USA
Clay Bowers, Michigan, USA
Maine Primitive Skills School, Maine, USA
Nature Mentoring, Nova Scotia, Canada
Nature Aventure Survie, France
Nature School Norway, Norway
Ecoastro, Brazil
*If you offer natural navigation training anywhere in the world and would like to be listed here for free, please get in touch.