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SIG (short for Seeing-I-Go) is a Bluetooth navigation app on smart phones. It can guide you indoor within large buildings and outdoor spaces around buildings. In particular, it works in buildings without any indoor maps.

Presents turn-by-turn directions in terms of simple spoken and visual instructions.
Uses routes for you according to your preferences.
Works with simple maps containing data on locations of destinations and pathways traversable by persons on foot and wheelchairs connecting the destinations.
Can warn you of obstacles ahead along your path.
Can use accessibility features of your smart phone as you wish.