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INCREASED SEPARATION REQUIRED (ISR)
Indicates the confidence level of the track requires 5 NM separation. 3 NM separation, 1 1/2 NM separation, and target resolution cannot be used.
Listed in the Pilot/Controller Glossary as a cross-reference to INCREASED SEPARATION REQUIRED (ISR), whose text is shown above.
Source FAA Pilot/Controller Glossary · checked 2026-08-25