A vessel cannot be USCG documented and state registered at the same time. If a documented vessel becomes state registered its USCG documentation is automatically invalidated. You will probably have no way of knowing this since the USCG probably will not know of the vessel's state registration and will continue to send its renewal notices. However, when the BAD happens, especially in foreign waters you could be in big trouble.
You continuously post incorrect or limited information on this despite the links provided every time.
If its only true where you live....remember we all mostly do not live there...
This from the BoatUS web site...
"Can a boat be both titled and documented?
No. A documented vessel may not be titled by a state. However, some states may require documented vessels to maintain their state-level registration. Regardless of registration status, all vessel owners must comply with state laws and pay applicable state taxes."
This about deletion from documentation from the USCG documentation web site...
"DELETION FROM DOCUMENTATION
A vessel may be deleted from documentation upon the request of the vessel owner or an
authorized agent on behalf of the owner. The request must be in writing and must include
the vessel’s official number and reason for deletion. The original Certificate of
Documentation (COD) is to be returned by the owner named on the certificate.
1. Please provide evidence of sale or transfer AND a statement indicating the
nationality of owner and/or country in which vessel will be flagged (in the event
the vessel is being sold to a non-US citizen(s) or being flagged in a foreign country).
Evidence of sale is required in the event vessel is sold foreign as per 46 CFR
67.171(c)(1).
2. A Certificate of Documentation (COD) is invalid and the vessel subject to deletion
from the roll of actively documented vessels when any of the situations listed in 46
CFR 67.171 occurs.
3. An original OR a copy of a release instrument signed by the mortgage holder
(mortgagee) is required before the vessel can be removed from documentation if
the vessel is covered by an outstanding mortgage of record.
4. Vessels of five net tons or more (determined by volume) used in fishing activities
on the navigable waters of the U.S. or in the Exclusive Economic Zone (EEZ), or
used in the coastwise trade must be documented unless the vessel is exempt from
documentation. See 46 CFR 67.9 for a list of exemptions.
5. If a letter evidencing removal from documentation is required, include that
information in the letter request with fee of $15.
6. If the request for deletion is accompanied by a complete, original or copy of a bill
of sale and $8 per page filing fee, it may be recorded to evidence transfer of
ownership. "