Might be a bit simple but why not the “North Star” (Polaris)? Navigation could work via analysis of stars positions relative to eachother/positions of constellations relative to the ship. You could justify it in-universe as being a nod to how early mariners used these same stars to navigate Earth’s oceans.
It’s kind of always been pretty Canadian. Both Kirk and Scotty from the original series are played by Canadian actors: Shatner (from Montreal) and Doohan (from Vancouver).