Don T Affect Navigation News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> i'm elise preston in santa monica, california, where crowds are coming to escape the extreme heat. also tonight, mixed signals. after a week filled with flight delays and cancellations, starting today, there's a new invisible threat that could cause more disruptions. i'm michael george in new york. new, more powerful 5g wireless signals could make your flight delays even worse. plus, immigrant crackdown. florida's new law that takes aim at undocumented workers and their employers takes effect today. rage in the streets. as france struggles to quash days of violent protests...

>> reporter: a deal with the fcc allows wireless companies to start powering up new 5g our towers near major airports today. an altimeter bounces radio signals off the ground to determine how high the plane is flying. but 5g signals could potentially interfere with those readings, making landing in fog or other poor visibility conditions dangerous. cbs news travel editor peter greenberg explains, this has nothing to do with your phone or whether it's in airplane mode. >> those don't affect navigation, but a 5g tower can because it's sending a sill, not for the plane, but that signal can actual...