Yes it's possible,
But you need more concentration because sometimes other factors may alter the circle existence. Try practicing it in the astral world before your attempt to actually use it in your mind. Also use any kind of divination you know how to use to feel if it's alright to make a circle at such time.
there is many ways to find north or south, try this one:
Face the sun rise and you will find north at your left.
Face the sun set and you will find south at your left.