This Message 25 payload is used to acknowledge reception of the Addressed Text Message, Addressed TOI or Addressed Overlay (Message 26, FIDs 0-3). FID 2 shall always be transmitted after receipt of the complete Addressed Message.
Links[1] https://www.e-navigation.nl/sites/default/files/asm_files/epic-15-05-29-uscg-foia-20151030-production-2.pdf