GPS Phone app

I am developing a mobile website using jquery mobile. I need to determine where the enduser is to send a start address to google maps or other mapping software. I will include an ending address based on where the business they select is located. I need both the map and turn by turn directions (critical), suitable for display on an iphone, android, or blackberry with the option for the user to change the start address if desired (not critical). This should be a simple project for someone with mobile gps expertise. Please include relevant links in your proposal as well as when you can start and what the estimated completion date would be. Please feel free to contact me if you need further information. ## Deliverables I would prefer mobile website pages rather than an application if possible. Must be able to work on iphone, android, blackberry at the minimum.