NON OVERWATER ACFT WAS GIVEN AN OVERWATER RTE.

Narrative

AT APPROX XA15 WE WERE REASSIGNED TO FLT FROM DFW TO TPA WHICH WAS RESCHEDULED TO DEPART AT XA40. WE ARRIVED AT THE ACFT AT APPROX XA30 AND PULLED UP THE FLT PLAN. FLT PLAN RTE WAS AS FOLLOWS: DFW DALL9 EIC J4 MEI TLH DARBS1 TPA. JUST PRIOR TO EIC; CTR CLRED US TO HRV. WHEN I ASKED HIM WHERE; HE SAID 'HRV; JUST S OF NEW ORLEANS.' I SAID THAT OUR FLT PLAN HAS US GOING OVER JAN MEI AND TLH. HE SAID WE ARE FILED OVER HRV J58 COVIA BLOND 2 TPA. WHEN I COMPARED OUR FLT PLAN WITH THE ACARS CLRNC; HE WAS CORRECT. OUR MISC 14 WAS THE SAME RTE AS OUR FLT PLAN. WE INITIALLY FLEW THE NEW RTE AND THEN DISCOVERED THAT THIS WAS AN OVERWATER RTE AND OUR ACFT WAS NOT OVERWATER EQUIPPED. WE GOT CLRNC BACK TO OUR ORIGINAL RTE AND CONTINUED TO DEST. SINCE THIS DISCREPANCY WAS DETECTED BEFORE REACHING EIC WHICH WAS COMMON ON BOTH FLT PLANS; NO DEV OR CONFLICT OCCURRED. IF CTR HAD NOT CLRED US TO HRV PRIOR TO REACHING EIC; WE WOULD HAVE TURNED THE WRONG WAY AT EIC AND A CONFLICT COULD HAVE DEVELOPED. I WAS UNDER THE IMPRESSION THAT IF YOUR FILED RTE IS CHANGED; THEN ACARS NOTIFIES YOU TO CONTACT CLRNC FOR A FULL RTE CLRNC. IF THIS IS NOT THE CASE; I FEEL THAT IT SHOULD BE.