SMT CAPT HAD AN UNQUALIFIED ACFT OWNER ACT AS FO ON AN IMC FLT. COM PROBS WITH ZMP RESULTED.

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WE WERE ENRTE TO HYR AFTER 4 HR 30 MIN FLT WITH THE UNDERSTANDING THAT IT WOULD BE NECESSARY TO COMPLETE AN NDB APCH TO NEAR MINIMUMS. THE WX AS RPTED BY ASOS HAD BEEN IMPROVING ABOUT EVERY 5 MINS UNTIL IT WAS 600-700 FT BROKEN; 1400 FT OVCST; 1.5 - 1.75 MI VISIBILITY; LIGHT SNOW AND MIST. ABOUT 45 MINS OUT; PRIOR TO TOP OF DSCNT; I BEGAN AN APCH BRIEFING WITH REGARD TO HOW WE WOULD CONDUCT THE DIFFICULT PROC. MY COPLT; ALSO THE ACFT OWNER AND MY EMPLOYER; HAD BEEN FLYING TOGETHER FOR SEVERAL MONTHS. THIS WOULD BE MY FIRST ARR AT HYR BUT FOR MY BOSS THIS HAD BEEN HIS FORMER HOME BASE ARPT; AND HE HAD FLOWN IN MANY TIMES INCLUDING AS COPLT ON HIS FORMER COMPANY TURBOPROP. AS I BEGAN HE TOLD ME VERBALLY AND WITH HAND/BODY LANGUAGE THAT THERE WASN'T REALLY MUCH THAT I COULD TELL HIM ABOUT HIS ARPT AND HE REALLY DIDN'T NEED A DISCUSSION. I REALIZED THAT HE DIDN'T UNDERSTAND THE PURPOSE OF AN APCH BRIEF; AND SO LIMITED IT TO CONFIGN; SPDS; ALT CALLOUTS; AND MISSED APCH PROCS. ABOUT 15 MI FROM HYR; ZMP CLRED US FOR AN NDB. WE CROSSED OVER THE FIELD; TURNED TOWARD THE BEACON; CROSSED IT OUTBOUND; CONFIGURED; COMPLETED PROC TURN INBOUND ALL IN IMC FOR THE LAST 50 MINS; AND WITH NO FURTHER CTR CONTACT CROSSED THE BEACON INBOUND FOR THE ARPT. WHEN WE BROKE OUT; WE WERE NOT IN A POS TO VERTLY CONTINUE A STRAIGHT-IN AND THERE WAS A LITTLE TOO MUCH MIST AND SNOW TO BE COMFORTABLE WITH A CIRCLE-TO-LAND; SO I ASKED MY SIC TO DECLARE A MISS. HE BECAME WRAPPED UP TELLING UNICOM WHAT WE WERE TO DO. I THOUGHT ABOUT SUGGESTING THAT HE NOT GET INVOLVED IN WORRYING ABOUT THE PEOPLE ON THE GND THAT WE NEEDED TO PICK UP; AND THAT HE STAY IN REAL TIME; AHEAD OF THE ACFT. I DECIDED NOT TO RISK STRESSING THE COCKPIT TONE AND SIMPLY REPEATED MY REQUEST TO CHANGE TO CTR FREQ AND DECLARE A MISSED APCH. HE STATED FIRMLY IN A NONSTANDARD PHRASING 'THEY CAN'T GET YOU.' I WASN'T SURE THAT I UNDERSTOOD WHAT HE MEANT AND I BEGAN TO WONDER IF I HAD MISSED SOMETHING ON THE PLATE OR A CTR COMMENT. I ASKED HIM TO XMIT A MISSED CALL ANYWAY. HE REPEATED EVEN MORE FIRMLY; 'THEY CAN'T GET US.' AT THIS POINT I WAS TASKED; PERFORMING A MISSED APCH TURN AND CLB BACK TO THE BEACON; AND WAS EVEN MORE FIRMLY CONVINCED THAT HE KNEW SOMETHING ABOUT HIS ARPT THAT I HAD FAILED TO REGISTER. AS WE APCHED THE MISSED APCH HOLD; THE SAME BEACON ONLY 5 MI FROM THE AIRFIELD; I ASKED HIM TO XMIT TO CTR 'IN THE BLIND' OUR INTENTIONS. MY SIC/PNF/BOSS REPEATED IN AN EXASPERATED MANNER; ONCE AGAIN SAID 'THEY CAN'T GET US; WE CAN'T GET THEM.' IN FACT HE WAS 100% CERTAIN AND COMPLETELY MISTAKEN; BUT I HAD ALLOWED HIS AUTH (INFORMAL) TO INFECT BOTH PLTS. WE WERE AVIATING; NAVING; BUT HAD FAILED TO COM OUR INTENT TO CTR. THE BOSS (COPLT) HAD MISINTERPED A CTR COMMENT TO THE EFFECT THAT THEY WOULD LOSE RADAR CONTACT ONLY DURING THE FINAL APCH SEGMENT. AS PIC; I SHOULD HAVE MORE RAPIDLY RESET TO A SINGLE PLT COCKPIT OP AS THOUGH MY COPLT WAS INCAPACITATED. WHILE THIS CONFUSION DID NOT RESULT IN ANY DIRECT RISK TO THE ACFT; IT DID COMPLICATE CTR'S TASK REQUIRING THEM TO PROTECT AIRSPACE. RELATED TO SUCH ERRORS IS THE LOSS OF SITUATIONAL AWARENESS OF ALT OR LATERAL/COURSE POS WHICH MAY OR MAY NOT INVOLVE COCKPIT CONFUSION.