46 C.F.R. § 515.26
No license or registration shall remain in effect unless valid proof of a financial responsibility instrument is maintained on file with the Commission. Upon receipt of notice of termination of such financial responsibility, the Commission shall notify the concerned licensee, registrant, or registrant's legal agent in the United States, by email, mail, courier, or other method reasonably calculated to provide actual notice, at its last known email address or address, that the Commission shall, without hearing or other proceeding, revoke the license or terminate the registration as of the termination date of the financial responsibility instrument, unless the licensee or registrant shall have submitted valid replacement proof of financial responsibility before such termination date. Replacement financial responsibility must bear an effective date no later than the termination date of the expiring financial responsibility instrument.
46 C.F.R. §515.26