INSTRUCTOR WITH SPI ON NIGHT XCOUNTRY FLT FORGOT TO TURN ON XPONDER.

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CAUSE: STUDENT FORGOT TO TURN ON XPONDER. IMPROPER USE OF CHKLISTS. CONTRIBUTING FACTORS: LACK OF PROPER FLT INSTRUCTOR SUPERVISION OF STUDENT PLT. INSTRUCTOR OVERCONFIDENCE IN STUDENT. I WAS ON A NIGHT XCOUNTRY WITH ONE OF MY STUDENTS. THE DEST WAS MEIGS FIELD (CGX) UNDERNEATH O'HARE'S MODE C VEIL. THE TRIP TO MEIGS WENT SMOOTH; AS WOULD BE EXPECTED BECAUSE I DEEMED THIS STUDENT TO BE ABOVE AVERAGE. FOR THE RETURN TRIP HOME; WE DECIDED TO FLY ALONG THE COAST (NEAR DOWNTOWN) TO SEE THE CITY AT NIGHT; THEN CONTINUE ON OUR WAY. THE PREFLT; RUNUP; AND TKOF WERE GOOD; AND WE HAD A GREAT VIEW OF CHICAGO FROM OUR AIRPLANE. AT THIS POINT I FOUND MYSELF ACTING AS A PAX; MORE ATTN FOCUSED ON THE OUTSIDE WORLD THAN WHAT MY STUDENT WAS DOING. IT WAS THEN; AFTER BEING IN THE AIR FOR APPROX 10 MINS AND ON OUR WAY HOME; THAT I NOTICED BOTH OF US NEGLECTED TO TURN THE XPONDER ON. I IMMEDIATELY TURNED IT TO ALT AND CONTINUED HOME UNEVENTFULLY. MY LACK OF CLOSE SUPERVISION OF AN OTHERWISE GOOD STUDENT LED TO A 10 MIN JAUNT AROUND CHICAGO WITH NO ALT READOUT FOR THE CTLRS.