Boy did I learn this the hard way. I was using a friends GPS the other day, I don't get mine until Christmas, and put it in my pocket without locking the screen. There's no telling what buttons got pushed. Well the touch screen stopped working on certain parts of the screen. I couldn't get to the calibration menu so I started searching online. It turns out if you hold the on button down for 30 seconds when you first turn it on it enters the touch screen calibration mode. You touch a dot that moves through the 4 corners of the screen and bingo, it works again.
Just thought I'd share.
Ed
Just thought I'd share.
Ed