AN LR35A CREW ERRONEOUSLY ENTERED VCN IN PLACE OF SIE IN THE GPS NAV SYS THEREBY DEVIATING FROM J121. AFTER CORRECTING THE RTE ERROR FLT WAS 300 FT HIGH XING TO BRIGS INTXN.

Narrative

ON A FLT FROM ZZZ1 TO ZZZ2; WE WERE GIVEN A RTE AMENDMENT BY ZDC; SOMEWHERE N OF DIW NDB; TO FLY J121 AFTER NORFOLK; HAMPTON (HTO); DIRECT. WHEN MANUALLY ENTERING THE RTE INTO THE GPS; FIX BY FIX; WE ACCIDENTALLY SUBSTITUTED CEDAR LAKE VOR (VCN) FOR SEA ISLE VOR (SIE); THE VCN TO THE AVALO INTXN. THIS CAUSED US TO DEVIATE FROM J121 AFTER XING THE RADDS INTXN. ABOUT 3-5 MINS LATER; ZDC ASKED IF WE WERE GIVEN A HDG TO FLY. WE RESPONDED NEGATIVE; AND THEN WERE INSTRUCTED TO MAKE A R TURN TO A HDG OF 080 DEGS TO RE-JOIN J121 AND CROSS BRIGS AT FL210. WE APOLOGIZED AND TOLD THEM WE HAD A SLIGHT 'NAV GLITCH.' THEY RESPONDED WITH 'NO PROB.' WHILE GETTING RE-SITUATED ONTO J121; WE STARTED DOWN LATE FOR THE BRIGS XING RESTR. WE MISSED BRIGS BY APPROX 200-300 FT; XING IT AT AROUND FL213. WE WERE THEN HANDED OFF TO ZNY WITHOUT FURTHER INCIDENT. ON THE HIGH ALT CHART; THE INFO BOX FOR VCN VOR LIES DIRECTLY UNDERNEATH THE SIE VOR. IT IS VERY EASY TO CONFUSE THOSE 2 VOR'S. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THIS LR35A HAS A KING GPS INSTALLED. THIS GPS MODEL IS CAPABLE OF EXECUTING DEPS AND ARRS BUT DOES NOT HAVE AN AIRWAYS DATABASE CAPABILITY. IN THIS INSTANCE; THE FO MISREAD THE NOAA CHART AND ENTERED VCN WHICH ON THE GOV CHART APPEARED TO IDENT J121 WHEN IN FACT SIE WAS THE NEXT NAVAID. AT THE TIME OF THE RTE ASSIGNMENT; THE CREW BECAME TASK SATURATED BECAUSE THE FO WAS MANUALLY ENTERING RTE DATA AND THE CAPT WAS OBTAINING ARR ATIS AND ANSWERING THE RADIO CALLS. RPTR STATED THAT HE WAS VERY BUSY AND DID NOT HAVE TIME TO BACK UP THE FO WHO IS NEW TO THE ACFT. THEY DID NOT DISCOVER THE ERROR UNTIL AFTER ATC CALLED.