Marvel: Sonar

Sean Cassidy (Banshee)
He can use his sonic powers as a form of sonar. By sending out precise, pure notes and listening to the returning, altered wave-front of the note, he can evaluate his surroundings in total darkness with varying degrees of resolution.

Theresa Cassidy (Siryn/Morrigan)
She can use her sonic powers as a form of sonar. By sending out a precise, pure note and listening to the returning, altered wavefront of the note, she can evaluate her surroundings in total darkness with varying degrees of resolution.