“The U.K.’s air safety regulator has released research about cell phone use on planes, warning of the serious effects that it can have on a plane’s navigational equipment.

The Civil Aviation Authority research found that standard cell phone use can cause a compass to freeze or to overshoot its actual magnetic bearing. Also, flight deck and navigation equipment indicators can be rendered unstable and inaccurate, and transmissions can interfere with critical audio outputs.

Cell phone use has long been banned on airplanes, along with use of many other electrical devices. But passengers have often accused airlines of being over-officious in their enforcement of the ban, even suggesting that it is unnecessary. Many airlines have had experience of passengers who are willing to break the ban in order to make a call. This latest research may frighten passengers into compliance with the rules.