Many mobile devices are now equipped with built-in GPS radios, and can be used for turn-by-turn navigation.  ITScriptNet supports collecting a breadcrumb trail while using such a navigation system on Windows Mobile devices.  However, what kind of system is best for you?

If you have a fleet with trucks and vans, consumer-grade navigation is not sufficient.  We like Electric Compass, which is designed for commercial applications and has good integration capabilities.  Electric Compass has published an excellent article detailing the differences between Consumer and Commercial navigation.