Originally Posted by Mudcat
You can lock into Track Up I assume?
Of course but that is not what is happening to JoaoPCF. Even if the Map Orientation is set to Track Up, the DISPLAY can rotate between Landscape and Portrait mode. So, doing as Emoto suggested will "lock" the DISPLAY from rotating when the built-in accelerometer thinks the unit is rotating (which can happen on any surface if there is enough vibration).