Well its an open platform where everyone can view your project since it was designed this way so that as many people can collaborate as possible. So it was designed to enable people to help on other peoples ideas.
Steven Reubenstone could you please share your insight.
Yes vibration it is then. Well i am afraid the view on use of smartphones is no more true these days. I myself know visually impaired people who use smartphones, and few use them extremely well like even browsing facebook and replying to comments and messages. So its an increasing trend and many technologies are being created to help them just do that. So if we are to think of the future, i think the visually impaired people will be exploiting smartphones for simplying their daily tasks.
Separate gps and gsm will do great too. We can use the smallest ones there are and make the cane as thin and light as possible.