tolerances thus when a radar detection event occurs the present embodiment can compare the detection event with known assigned radar gun frequencies if the detection event is within the tolerance of a known radar gun frequency then the system alerts and reports to the operator that a valid radar gun is near to assist the operator in mentally processing the report the system displays the assigned frequency of the radar gun as opposed to the exact detected frequency if the detected frequency is outside of the known gun tolerance then the system merely displays the band of the frequency detected for example u201c ka u201d is shown the user if the frequency is in the ka band and is not within the tolerance of a known radar gun in another embodiment the system displays assigned characters associated with the assigned frequency of the radar gun as opposed to the exact detected frequency for example if a 33 8 ghz radar gun is detected the unit may display u201c bee iii u201d instead of the assigned 33 8 ghz nominal frequency in another embodiment the detector device includes a global positioning system gps module that allows the detector to determine its location the gps device may be an integral component of the detector or it may be peripheral with a connection to the detector 39 s processor 86 with a gps module it is possible for the system to serve as a u201c location advisor u201d with respect to red light cameras for example because red light cameras are stationary surveillance systems it is possible to map the location of each with latitude longitude coordinates these coordinates may be stored in the detector device onboard memory for later recall as a.