A PA44 INSTRUCTOR ON AN IFR TRAINING FLT ALLOWS STUDENT TO FLY WRONG HEADING FOR PRACTICE APCH INTO LAL. THE APCH CTLR INTERVENES AND VECTORS ACFT BACK ON COURSE TO INTERCEPT RADIAL. TRAINING INTERCEPTS WRONG RADIAL.

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THIS EVENT WAS AN INST TRAINING FLT FOR THE PURPOSE OF PRACTICING DME ARCS AND APCHS. WE WERE GIVEN INSTRUCTIONS TO HEAD 360 DEGS ON DEP FROM LAL AND INTERCEPT 10 DME AND ARC W TO THE 120 DEG RADIAL FROM LAL. HOWEVER; THE STUDENT HAD TURNED R TO ARC E AND I LET THE STUDENT CONVINCE ME THAT WAS OUR INSTRUCTIONS. SHORTLY AFTER WE HEADED EASTERLY; TAMPA APCH INFORMED US THEY NEEDED US TO ARC W. WE IMMEDIATELY TURNED TO THE W. THE STUDENT SET IN WHAT SHE THOUGHT WAS THE 120 DEG RADIAL; HOWEVER; THE RECIPROCAL 300 DEG RADIAL WAS SET IN THE HSI. WHEN WE INTERCEPTED THE 300 DEG RADIAL (THOUGHT TO BE THE 120 DEG RADIAL) WE TURNED INBOUND TOWARD THE LAKELAND VOR (LAL) AS INSTRUCTED AND THEN INFORMED TAMPA APCH OF OUR TURN INBOUND AND MADE A REQUEST TO START PRACTICE INST APCHS INTO LAKELAND. AT THAT MOMENT; I NOTICED THE ERROR AND REALIZED WE WERE ON THE RECIPROCAL RADIAL VICE 120 DEG RADIAL. HOWEVER; TAMPA APCH GAVE US AN INITIAL VECTOR FOR OUR FIRST APCH. WE MADE 2 INST APCHS INTO LAKELAND AND TERMINATED THE FLT 1 HR EARLY DUE TO MY ILLNESS. I WAS EXPERIENCING FEVER; NAUSEA AND FATIGUE. CONCLUSION; THE ONSET OF INFLUENZA HAD SEVERELY DEGRADED MY PERFORMANCE AND LED TO MISTAKES IN SIMPLE INST NAV. FORTUNATELY; THIS FLT CONCLUDED WITHOUT INCIDENT; BUT REINFORCES THE IDEA TO STAY ON THE GND IF NOT WELL.