Check out this amazing tool from Andrew Rogers and Brad Sparks.
Every band director and drum corps staff has their own tips and tricks for lining up the sounds of an ensemble on the marching band field. Performers are often spread all over the field, the metronome often moves around in rehearsal, and sometimes the drum majors hands aren't the right thing to be watching. This incredible excel file maps out zones on the field for listening back, playing with the hands, and even when to anticipate the drum majors hands. You can even change the location of the judges or audience!
Check out Andrew's video tutorial here: