Preparations for a slow photo walk

I have packed my cameras for a tomorrow’s photo session with an old friend.  In front and between the cameras is a reliable tool for deciding the exposure.  A home-made Sunny 16 table.  You set the shutter speed to 1/ISO and then read the table.  With a 200 ISO film I would choose 1/250 and f 11-16 for a sunny day.  Will it work? Time will tell.