  $\text{GdRu}_{\text{2}}\text{Si}_{\text{2}}$ is a centrosymmetric magnet in
which a skyrmion lattice has recently been discovered. Here, we investigate the
magnetic structure of the zero field ground state using neutron diffraction on
single crystal and polycrystalline
$^{\text{160}}\text{GdRu}_{\text{2}}\text{Si}_{\text{2}}$. In addition to
observing the principal propagation vectors $\mathbf{q}_{1}$ and
$\mathbf{q}_{2}$, we discover higher order magnetic satellites, notably
$\mathbf{q}_{1} + 2\mathbf{q}_{2}$. The appearance of these satellites are
explained within the framework of a new double-$Q$ constant-moment solution.
Using powder diffraction we implement a quantitative refinement of this model.
This structure, which contains vortexlike motifs, is shown to have a
one-dimensional topological charge density.
