Each police helicopter is equipped with a state of the art aerial photo aid for disaster missions called Avalex.  This is a GPS based map system allows the flight crew to enter an address, intersection or any named location and provide directions to that point.  This technology was  purchased through a federal grant from the Urban Area Security Initiative for use during a natural disaster or terrorist attack.  Locations can be quickly marked and saved to highlight a piece of evidence or a targeted search area.  The map system is updated annually to accurately reflect new roads and other construction.  It also provides longitude/latitude data which provides information to marine units on the exact location of a boat in distress or hazard to navigation.