  The full automorphism group of a certain elementary abelian $p$-cover of the
Hermitian curve in characteristic $p>0$ is determined. It is remarkable that
the order of Sylow $p$-groups of the automorphism group is close to Nakajima's
bound in terms of the $p$-rank. Weierstrass points, Galois points, Frobenius
nonclassicality, and arc property are also investigated.
