TeleNavTrack from Telenavigation is a mobile-phone-based tracking service that integrates dispatching, messaging, and navigation with the global positioning system. It operates over Nextel's all-digital wireless network. Dispatchers can manage fleets from a personal computer, locating drivers closest to a customer location and sending messages directly to the driver's Motorola Java-enabled mobile phone with GPS capabilities. The system also features electronic time-sheet reporting. Estimated list price: $9.99 (per month per device for basic service).