Presently, there are no sophisticated navigational technologies that fit this criteria. The technology must be light weight, inexpensive, and non-obtrusive. Most technologies for the blind are too expensive, too heavy, and they are obvious and ugly. We have a long way to go. Fortunately, there are many dedicated, stubborn, persistent inventors who have made great progress and who continue to make advances.
Few systems have more than one function.
Technologies should have long battery life and should work in adverse weather conditions. Battery life is an across the board problem for all manufacturers. The problem is being continually addressed by many multi-national corporations and government agencies, but we have a long way to go. Most inventors have not gotten around to testing the systems in the dead of winter, in high winds, in the rain, or on the beach. Technologies should be backed by a strong support network.