I own a Pioneer Avic N2 in-dash GPS unit. It requires me to be stopped, with the ebrake engaged, before it will allow me to enter navigation information. From searching various forums over the internet, all other in-dash GPS products such as Kenwood and Harmon Kardon also have a similar requirement. Factory installed GPS units, to my knowledge, also have this restriction (Toyota Prius). It has also been variously stated that this safety feature is required by law. Now an interesting fact: none of the portable GPS units have this restriction (Garmin, TomTom, Magellan, Moov, etc). They are perfectly fine with you entering nav data while the car is moving! So the obvious question is, is this safety feature really a LEGAL requirement, or is it just a "cover our butts" precaution by the in-dash manufacturers, put in because it is so easy and convenient for them to do so? And if it really is a legal requirement, why hasn't the law come down hard on all those portable GPS makers? This seems like an obvious question to me, but amazingly I have not been able to find it being asked anywhere through Google search. All internet forums dealing with the nav lockout restriction concern themselves with defeating it, and most offers of solutions also come with the warning that it is illegal to do so. But is it really?