Just a FYI, some Massoth 2.4GHz Navigators produced about two years ago have faulty transmitter boards. I sold a couple of these units to customers two years ago and they experienced wireless connectivity issues.......periodic loss of wireless connectivity. Initially I thought it was caused by interference with other 2.4GHz devices at their locations. But when one of the units was returned to me, replacing the Navigator's transmitter board with a new board solved the problem. I've returned the two defective transmitter boards to Massoth Germany for replacement.