How to intonate play notes in tune on a lined / marked fretless bass - Peavey Cirrus Fretless

This is a quick tutorial on how to get your fingered notes in tune when you play a lined fretless bass like this USA Peavey marked fretless. Your finger's position is critical for you to play the notes cleanly in tune. There are also some concerns around stretches and intonation instability. Once you understand how to intonate properly, you should be able to play chords or chordal passages in tune fairly easily.