ABSTRACTAnalytical and simulation models are described which can evaluate the use of automatic dependent surveillance (ADS) with precise navigation for intersecting track route structures. Although the analysis is applied for an area where Loran‐C is available, it is also relevant to GPS. It is shown that, by combining ADS and accurate navigation such as Loran‐C, it may be possible to raise the flow rates on intersecting tracks by as much as an order of magnitude over those possible using current over‐the‐ocean air traffic control (ATC) procedures. This new concept would provide for the same level of safety as current pro