Canon EOS-1D X Af Setting Manualbook page 24

AF Configuration Tool [Parameters]
Set tracking for subjects that move or stop suddenly
[+1/+2] is effective for fast sports, which may include sudden stop-start motion
A track and field example where an
athlete is running at a consistent
s p e e d . [ 0 ] i s v e r y s u i t a b l e f o r
s u b j e c t s m o v i n g a t a s t e a d y,
c o n t i n u o u s r a t e o f s p e e d —
regardless of whether that speed is
fast or slow.
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Accel./decel. tracking
Examples where the [0] setting is effective
Track and field events where constant speed is common