  Grothendieck-Witt spectra represent higher Grothendieck-Witt groups and
higher Hermitian K-theory in particular. A description of the Grothendieck-Witt
spectrum of a finite dimensional projective bundle $\mathbb{P}(\mathcal{E})$
over a base scheme $X$ is given in terms of the Grothendieck-Witt spectra of
the base, using the dg category of strictly perfect complexes, provided that
$X$ is a scheme over $\text{Spec }\mathbb{Z}[1/2]$ and satisfies the resolution
property, e.g. if $X$ has an ample family of line bundles.
