the author of this app says:
Monitor your vehicles and drivers directly from your iPhone!
Instantly locate and communicate with any mobile worker, at any time - whether you're on the road or in the office. You'll be able to:
-Instantly find any vehicle's location, status and proximity to you
-Directly text or call that mobile worker with one touch
-View the location of all of your fleet vehicles on a map
-Browse a list view showing all mobile workers and their status
Even from outside the office, you can always be in touch with your entire fleet using Navtrak's iPhone app.
- Requires iOS 3.1 or later