Can you lock the phone with Navigon or Tom Tom running? As that is the answer I think if battery life is to be preserved. With Blind Square, you can lock the screen and all the information is announced to you by another voice. However, if Voice Over can do this then we're in with a chance to conserve our batteries. If you also remember, if you have a guide dog or cane or anything else in your hands etc then it's going to be difficult to touch the I phone screen especially if it's in your bag, pocket or executive bag/brief case. For me, if I had the product now, I'd want to be able to put my I phone in my bag with the screen locked and for Voice Over to tell me where I am etc etc. Thank you very much. Kawal. On 11 Jul 2013, at 02:50 AM, George B <gbmagoo@xxxxxxxxxxx> wrote: > charles, > > you know i tested other apps. so here is what i found out today with the > seeing eye app. > > i had my phone a iPhone 4's, fully charged. > i started the seeing eye app at a bus stop by my house and went streight up a > highway for a 24 minute bus ride. when i got off the bus my battery level > was at 85 per cent. > now, doing the same with navigon or tomtom / u s a as it is listed on the > phone my battery has only went down to 96 or 95 per cent. > > just wanted to give you that heads up.