You can go into the Options editor and change the Real Navigation settings to how you want them. Instead of 30 minutes to get a celestial fix that might be 5km off you can set it to be an instant fix directly on your actual position.
Sure it might be cheating, but going full Real Nav andm as Mini found out, never ever knowing exactly where you are, can be over challenging. So adjust the options to how you want it and you'll enjoy the game a lot more I bet.
If I could ever get the standimeter to work I might use less precise plots, but till that day I'm happy with my current settings.