BearingValid alwaya false on Motorola Atrix

Hello!

My GPS-App runs on every device, I haved tested it. But on my new Motorola Atrix, GPS1.BearingValid is always false, so that this line doesn't run on my phone:


I can get the bearing without problems, but I don't know, if it is advisible to get the bearing without checking it with BearingValid. Knows someone the reason for that?

Thanks for help....