A sonar system using frequency bursts. The network of healthcare businesses that use the system is referred to herein as a Health Data Network, or HDN. A processor receives the electronic signal from the chamber, and uses software to process the digital data, store it, and communicate it over an electronic network. , rolling the vehicle more than 0\xb0 and less than 180\xb0 from the last wheel position. A method of semi-permanently mounting the device is described which requires no permanent alterations to the vehicle while providing improved visibility of alarm signals, a simple display technique, and controls which do not require the operator to remove hisher hands from the vehicle handlebars.