1. A navigational aid for the visually impaired, comprising a location sensor capable of providing the current geographic location of the navigational aid including altitude; an inertial measurement unit; a computer processor; a database containing map data; a non-volatile memory; and a user interface, wherein the map data comprises geographic location information pertaining to a region in which the navigational aid will be used, wherein the map data further comprises information on a structure of one or more objects within the region, and wherein the location sensor and the inertial measurement unit are used to compute a location and an orientation of the navigational aid in three-dimensional space, and wherein the navigational aid uses the location and orientation, along with the map data, to provide navigational instructions and angle-dependent directives to a user to locate objects along a travel path.