OLDWICK, N.J.--( BUSINESS WIRE )-- A.M. Best Co. has affirmed the financial strength rating of A (Excellent) and issuer credit ratings of "a+" of Navigators Insurance Company (Navigators) and its wholly owned and 100% reinsuredsubsidiary, Navigators Specialty Insurance Company (Specialty). Concurrently, A.M. Best has affirmed the ICR of "bbb+" and the debt ratings of "bbb+" on $114 million 7% senior unsecured notes, due 2016 as well as the shelf ratings of "bbb+" on senior unsecured notes, "bbb" on subordinated notes and "bbb-" on preferred securities of Navigators' publicly traded ultimate parent, The Navigators Group, Inc. (Navigators, Inc.) ( NAS: NAVG ). The outlook for all ratings is stable. All companies are domiciled in New York, NY.