The ZTrak asset locator from Zonar Systems tracks construction equipment, shipping containers, hazmat trailers, rental equipment and other high-security items. Using internal antennas broadcasting on both cellular GSM and 50-channel GPS communication, the device provides location data once or twice daily. Designed to withstand harsh environments, the device has a five-year battery life that can be extended to 10 years. The device attaches magnetically or can be bolted to any size container. "Some also have used industrial-grade, two-sided adhesive tape. That works as well," says Chris Oliver, vice president of sales and marketing at Zonar Systems.

The locating device measures 2.25 by 2.25 by 10.5 inches, approximately the size of a can of tennis balls, and weighs 2 pounds. It can operate in temperatures from -22 to 167 degrees F and is vibration and water resistant.

The device enters a low-power sleep mode when not in use, conserving battery power. When pinged, the device "wakes up," identifies where it is and sends encrypted data over a VPN (virtual private network) to servers and the Web-accessible Ground Traffic Control software. The password-protected portal provides location reports and maps, showing where the device is and where it has been over time.

A geo-fence can be drawn around the locator. Should the device "wake up" outside the fence, it would note that it has been moved. Devices are assigned to a single piece of equipment, but can be moved and reassigned using the Ground Traffic Control software. 877/843-3847;

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