Dan is an expert in the use of natural echo location. He played video clips from national television news programs showing him (and his friends and students who are blind) riding bicycles and dirt bikes. Dan has a strategy and curriculum for teaching natural echo location.

It is a logical progression to go from natural echo location development to the use of enhanced sound navigation. Dan has taken on Leslie Kay's KASPA technology and is working to reduce the weight and cost of the units. Sonification systems are a form of vision substitution, and Dan's presentation is an overview of this important wayfinding field.

Dan discussed the trade off that occurs with sonification technology. The range of the tools is related to the field of view and the resolution; changes in any one of the areas has an impact on the others. Dan's goal is to "audify" the environment, making the surroundings accessible through intelligent auditory pattern recognition. The key is to optimize the auditory signals for specific environments.