33 C.F.R. § 161.19
Unless otherwise stated, at least 15 minutes before navigating a VTS area, a vessel must report the:
[CGD 90-020, 59 FR 36324, July 15, 1994, as amended by USCG-2011-1024, 78 FR 51671, Aug. 21, 2013; USCG-2005-21869, 80 FR 5334, Jan. 30, 2015]