Check this out for Navigation !
The company I work for ServiceTask
just recently launched this new FREE web app called RouteTask
. It's a route optimization tool and GPS, you simply enter the addresses of your customer's jobs, your start/end, times and it will automatically find the most efficient route for you ! Works on just about any internet browser so you can even use it on the go for your mobile device.
Please check it out and let me know what you think !