five years
Radar guns used by law enforcement in Massachusetts must be calibrated at least once per year to ensure accuracy. However, some departments may require calibration more frequently based on their individual policies and usage.
You can get radar detectors from Bestbuy.com and from Amazon.com. You should make certain that these devices are legal in the state you reside. In many places like Virginia they are illegal.
airplane..bwahahahaha....
sonar devices map the sea floor, radar just boils water unless the signal is balanced ungodly.
The air traffic controller used radar to track the incoming airplanes.
Radar detectors are legal for passenger vehicles in North Carolina. However, they are prohibited for use in commercial vehicles. It is important to note that while radar detectors are legal, the use of radar jammers is illegal in North Carolina and throughout the United States. Radar detectors are devices that can detect radar signals emitted by police radar guns, while radar jammers are devices designed to interfere with or block radar signals.
Ground control, on initial contact.
The radar works just fine, but the operator (the traffic officer) may not be able to see an approaching vehicle as well or as far away in fog conditions. The proper way to use traffic radar is to observe a speeding vehicle, visually estimate its speed, and then confirm the speed with the traffic radar. In dense fog, the traffic radar may indicate speeding vehicles the officer cannot see.
None, they are legal!
No, not on the scene. But if you go to court the officer will have to present certification as to their training to operate it, and the fact that was"calibrated."
Air Traffic Control Use Radar Radio Detection and Ranging to track aircraft! Air Traffic Control Use Radar Radio Detection and Ranging to track aircraft!