A new, precise range‐range electronic navigation system, ARGO (Automatic Ranging Grid Overlay), has been developed commercially for application to deep ocean surveys. The mobile, shore‐based system is designed to position up to eight simultaneous users, all operating on a single frequency, to ranges out to 400 mi. The U. S. Naval Oceanographic Office has utilized ARGO successfully in a joint survey with the United Kingdom of Anegada Passage. A description of the system and ARGO performance in the context of the survey are presented.