Argo Navis, or simply Argo or Navis, genitive Argus Navis, Argus, or Navis was a former constellation, now split into 3. It was the largest constellation, and was located right on the milky-way.
Split
Argo Navis, representing the ship, was split into 3 modern constellations:
pyxis, the mariner's compass, may also be counted.