  The canonical velocity-dependent one-scale (VOS) model for cosmic string
evolution contains a number of free parameters which cannot be obtained ab
initio. Therefore it must be calibrated using high resolution numerical
simulations. We exploit our state of the art graphically accelerated
implementation of the evolution of local Abelian-Higgs string networks to
provide a statistically robust calibration of this model. In order to do so, we
will make use of the largest set of high resolution simulations carried out to
date, for a variety of cosmological expansion rates, and explore the impact of
key numerical choices on model calibration, including the dynamic range,
lattice spacing, and the choice of numerical estimators for the mean string
velocity. This sensitivity exploration shows that certain numerical choices
will indeed have consequences for observationally crucial parameters, such as
the loop chopping parameter. To conclude, we will also briefly illustrate how
our results impact observational constraints on cosmic strings.
