The other major source of false alarms are the other industries that also use radar: door openers at grocery stores, motion sensor alarms at banks, cell phone towers, airport radar systems, etc. Unlike the issue with other motorist’s radar detectors spewing microwaves, these other sources are not technically different; it’s the exact same equipment, just being used for a different purpose. In a strict technical sense, therefore, they’re not really false alarms at all. What to do? Well, for years there wasn’t really anything to do but grin and bear it. Recently, some of the better detectors have begun to incorporate GPS technology. Here’s how it works. On your way to work where you pass the grocery, for example, you mark the spot in your detector’s GPS memory. From that time on it will ignore the signal at that spot. What if a conniving cop decides to set up shop at the same spot in the future? No problem. The unit will only ignore one signal at that location. If a second signal is ever present at that location, the detector will alert you as usual. Finally, a solution to this long-time aggravation is at hand. And anyway, if you’re into serious geekology like we are, having GPS capability on your detector is just pretty damn cool.