  Exploiting the correspondence between Wigner distribution function and a
frequency-resolved optical gating (FROG) measurement, we experimentally
demonstrate existence of the chessboard-like interference patterns with a
time-bandwidth product smaller than that of a transform-limited pulse in the
phase space representation of compass states. Using superpositions of four
electric pulses as realization of compass states, we have shown via direct
measurements that displacements leading to orthogonal states can be smaller
than limits set by uncertainty relations. In the experiment we observe an
exactly chronocyclic correspondence to the sub-Planck structure in the
interference pattern appearing for superposition of two Sch\"{o}dinger-cat-like
states in a position-momentum phase space.
