EMS HELI FLIES CLOSE TO PROHIBITED AREA.

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I WAS FLYING A HELI OWNED BY THE DEPT OF PUBLIC SAFETY AND OPERATED BY THE STATE POLICE. WRITER WAS PIC DURING AN EMS FLT FROM ABC HOSPITAL TO XYZ HOSPITAL. WRITER WAS ON A 288 DEG HDG AND APPROX 3 MI N OF THE N EDGE OF PROHIBITED AREA. WRITER WAS IN COM WITH XYZ APCH AND WAS HANDED OFF TO ZZZ; 120.75. WRITER ASKED ZZZ IF EMS FLT COULD TAKE UP A HDG OF 240 DEGS AND FLY TOWARD XYZ HOSPITAL WITHOUT VIOLATING THE PROHIBITED AREA. WRITER WAS TOLD THAT HE COULD. WRITER TOOK THAT HDG AND WAS LOOKING FOR THE HOSPITAL; THE LORAN BEING USED AS WELL AS VISUAL NAV. WRITER WAS NOT FAMILIAR WITH THE HOSPITAL AND WAS SCANNING THE AREA FOR THE PAD. ZZZ TOLD WRITER THAT THE TWR HAD BEEN ALERTED THAT HELI WAS WITHIN 1 MI OF THE PROHIBITED AREA. WRITER HAD BEEN PAYING CLOSE ATTN TO PROHIBITED AREA AND TURNED MORE TO THE W FROM HIS 240 DEG HDG; THINKING THAT HELI WAS OUT OF PROHIBITED AREA. WRITER THEN SAW THE OBSERVATORY; APPROX 1 MI AWAY; WHILE FLYING TOWARD THE RIVER; IN AN EFFORT TO FIND THE HOSPITAL AS THERE WAS A SPINAL INJURY PATIENT ONBOARD AND THE LORAN WAS EVIDENTLY OFF TARGET. WHEN WRITER FOUND THE HOSPITAL PAD; THE LORAN SHOWED THE PAD .8 MI TO THE OF THE PAD'S ACTUAL LOCATION. THE TWR TOLD WRITER THAT THEY HAD MR. X ON THE PHONE. WRITER TOLD THE TWR THAT HE WAS CIRCLING THE HOSPITAL PAD; TRYING TO CONTACT THE HOSPITAL TO CONFIRM THAT HELI WAS AT THE CORRECT LOCATION. WHEN WRITER LANDED; HE WENT INTO THE HOSPITAL AND CALLED THE POLICE ON LANDLINE AND ADVISED THEM WHAT HE HAD DONE AND THE CIRCUMSTANCES; GIVING HIS NAME; RANK AND AFFILIATION (THE STATE POLICE). NOW THAT WRITER KNOWS EXACTLY WHERE THE HOSPITAL IS; IN THE FUTURE; IT IS HIS INTENTION TO TAKE THE HELI RTE TO AVOID THIS HAPPENING AGAIN. WRITER HAD NOT BEEN IN THE AREA IN MORE THAN A YR AND HAD NEVER BEEN TO THIS PARTICULAR HOSPITAL. WRITER DID CHK THE SECTIONAL BEFORE LEAVING THEH ABC HOSPITAL.