URNT11 KNHC 060427 97779 04274 70160 72658 15400 08534 19179 /2437 81738 83625 RMK AF966 0320A ODETTE OB 23 RADAR CENTER FIX 15.5N 72.5W, RADAR CURVATURE BANDING E SE S, NAV ACCURACY 8 NM. MODERATE ATTENUATION.