Like Radar , which suggests the appearance of something ‘out of view’ as it relates to ambitions, dreaming of sonar has more of an association with feelings that you are not acknowledging. You are being told that there is something there although you may not be aware of it. To dream of being in a submarine shows how you are exploring the unconscious or what lies below the surface of consciousness. Using sonar shows active steps you are taking in to follow intuition or inner guidance.