Yes the nav key being the main component on the hand set has rendered the unit just about useless. Uniden said I could return it to get fixed, at a cost they could not give me. And for the price I paid this is a real inconvenience. But to buy a new one...

We bought this as we were told we could get up to 1000m we are lucky to get service in the other end of our house let along our backyard. Will be returning item to store back to 2.8Ghz I guess

It is a very well featured phone and reception is very clear using 5.8GHz so it will not interfere with any wireless devices. The speaker on the handsets are loud enough in most situation. The only short coming is that at the highest setting the ring...