All Systems are different, I find my Garmin Navigator 6 odd to use no logic to how to get to certain parts etc. after a while it becomes natural, same as Sensus Nav System, it is a learning process, tbh you can tell it where you want to go (again once you learned how)
How accurate it is, not entirely sure what you mean, but as for me I have used it a quite a few times now to get to a destination, and it gets me there, (assuming it is on the map, one was not until after the update)
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