If you are in NY's portion of LIS with a CT marine license you are good to go. Once you go outside of LIS (past the Race, into Block Island Sound, etc., then you have to comply with that individual state's requirements for licensing. As you pointed out, to fish past the Race/south side of Long Island, etc., you need a NY license. RI is only going with the Federal Registry (the last I heard), so I don't know if they will accept a CT marine license or not. I know that we do not accept the Federal registry permit in CT waters so there is no reciprocity for that type of permit. Our regulation is specifically worded. Once MA, ME, NH and RI go with their own version of marine licenses, if their regulation/statute offers reciprocity to CT anglers who hold a marine license our regulation automatically kicks in and offers their marine license holders reciprocal fishing privileges.

As far as a map goes, it's the state border on the water that defines which license is required.

Here's the exact wording from the public act:

PA 09-173 Sec. 6. Section 26-46 of the general statutes is repealed and the following is substituted in lieu thereof (Effective June 15, 2009):

(a) If and when the state of New York, the state of Massachusetts or the state of Rhode Island enacts a similar law granting reciprocal privileges to residents of this state, any person who holds a license to fish in inland waters in the state of New York, the state of Massachusetts or the state of Rhode Island may fish in inland waters lying partly in this state and partly in such adjoining state, or in such waters as negotiated by the Commissioner of Environmental Protection of this state and any similar authority in such adjoining state, without a nonresident inland waters license to fish as required by this chapter, [; ] provided such nonresidents shall be subject to all other provisions of the statutes and the regulations of the commissioner relating to fishing in lakes and ponds.

(b) If and when the state of New York, the state of Massachusetts, the state of New Hampshire, the state of Maine or the state of Rhode Island enacts a similar law granting reciprocal privileges to residents of this state, any nonresident who holds a marine waters fishing license issued by one of said states having such reciprocal privileges may fish in the marine district or land marine species in Connecticut and shall not be required to purchase a Connecticut nonresident marine waters fishing license. Such nonresidents shall be subject to all other provisions of the statutes and the regulations of the commissioner relating to fishing in the marine district.