DURING ENTRY INTO PARACHUTE DROP ZONE FLC ENCOUNTERS ACFT XING THEIR PATH.

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WE WERE ON A WINGS-LEVEL HDG OF 260 DEGS MAGNETIC COMMENCING A RUN-IN TO THE DROP ZONE AT 1500 FT MSL; 130 KIAS FOR STATIC LINE PARACHUTE OPS. THE PLT AT THE CONTROLS NOTICED AN ACFT XING OUR FLT PATH FROM L TO R ON AN APPROX HDG ON 310-330 DEGS. THE OTHER ACFT WAS IDENTED BY THE PIC AS A V-TAIL BEECHCRAFT BONANZA. HAD THE XING ANGLE BEEN SLIGHTLY DIFFERENT OR HAD THE PIC SEEN THE ACFT SOONER; IT WOULD HAVE BEEN EASY TO IDENT THE ACFT N-NUMBER. A NOTAM HAD BEEN ISSUED FOR THE DROP ZONE STATING THAT PARACHUTE OPS WERE BEING CONDUCTED FROM 13000 FT MSL AND BELOW. NO EVASIVE ACTION WAS REQUIRED ON THE PART OF THE PF WHO CONTINUED HIS APCH TO THE DROP ZONE. RADIO COMS WITH FLT SVC ON 122.5 WERE LARGELY UNSUCCESSFUL DUE TO THE LOW ALT OF OUR ACFT. WE WERE; HOWEVER; IN COM WITH NAVAL AIR FACILITY AND THEY WERE AWARE OF OUR POS AND THE NATURE OF OUR OPS. THE VFR SECTIONAL CHART DOES NOT ANNOTATE THE AREA AS A DROP ZONE. IT IS MY CONJECTURE THAT THE ACFT DEPARTED SOME OTHER ARPT TO THE E; HEADED W WHILE REMAINING S OF THE CLASS E AND CLASS D AIRSPACE THEN TURNED NW TO REMAIN W OF THE RESTR AREA. THIS RTE OF FLT TOOK THE BONANZA THROUGH THE APCH COURSE TO THE DROP ZONE.