  An orthomorphism over a finite field $\mathbb{F}_q$ is a permutation
$\theta:\mathbb{F}_q\mapsto\mathbb{F}_q$ such that the map
$x\mapsto\theta(x)-x$ is also a permutation of $\mathbb{F}_q$. The degree of an
orthomorphism of $\mathbb{F}_q$, that is, the degree of the associated reduced
permutation polynomial, is known to be at most $q-3$. We show that this upper
bound is achieved for all prime powers $q\notin\{2, 3, 5, 8\}$. We do this by
finding two orthomorphisms in each field that differ on only three elements of
their domain. Such orthomorphisms can be used to construct $3$-homogeneous
Latin bitrades.
