CAPT OF MD80 ADVISES NON-OVERWATER EQUIPPED ACFT MAY BE GETTING INAPPROPRIATE CLRNCS OVERWATER BEYOND 50 MI ENRTE TO FLORIDA.

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THIS IS TO ALERT THE S80 FLEET TO THE POTENTIAL FOR AN OVERWATER VECTOR IN A NON-LIMITED OVERWATER ACFT. THERE ARE NO PLACARDS OR MESSAGES TO ALERT YOU TO THE FACT THAT YOUR ACFT IS NOT 'OVERWATER.' I FEEL WE SHOULD HAVE ONE OVER THE CAPT'S PFD AND ON THE FLT PLAN UNDER 'ACFT RESTRS.' WE WERE DELAYED OVER 4 HRS DUE TO SNOW IN ZZZ AND FOR DEICING. OUR RTE OF FLT; DUE TO THE WX; ON THE EAST COAST VERY INLAND. IN FACT; WE WERE FILED AS FAR W AS GVE. IN THE VICINITY OF RDU; CTR GAVE US DIRECT VRB; WHICH WE GLADLY ACCEPTED BEING SO LATE. NEVER DID IT OCCUR TO ME THAT WE WOULD 'COAST OUT' SO FAR FROM OUR PRESENT POS. NOR DID IT OCCUR TO ME THAT WE WERE NOT AN OVERWATER ACFT. THE PREFLT WAS SEVERAL HRS AGO WHICH WAS THE LAST TIME I LOOKED AT THE LOGBOOK WHICH WOULD HAVE REMINDED ME ABOUT BEING OVERWATER EQUIPPED. THE FLT PLAN ATTEMPTS TO WARN YOU OF THIS CONDITION BY 'OMISSIONS;' IE; NOT LISTING YOU AS LIMITED OVERWATER. WELL INTO THIS DIRECT CLRNC; WE HAD THE LIGHTS UP FOR DINNER AND WERE JUST TURNING THEM DOWN WHEN I COULD SEE HOW FAR OFF THE COAST WE WERE. THIS IS WHEN IT ALL CAME TOGETHER REMEMBERING ABOUT THE SPECIAL OVERWATER STATUS WE NEEDED. I PROBABLY SHOULD HAVE REQUESTED A TURN TOWARDS THE COAST; BUT AS WE WERE HDG TOWARDS THE COAST AT THAT TIME; I ELECTED TO CONTINUE. I ALSO MAKE NO EXCUSES HAVING OVER 5000 HRS IN THIS ACFT 3.5 YRS AGO. HOWEVER; THIS ISSUE WASN'T COVERED IN REQUALIFICATIONS. THIS IS A VERY INSIDIOUS EVENT THAT WE COULD DO BETTER TO PREVENT.