On a recent trip to London, my position got lost on the NB1 nav screen, and the car icon ended up in the sea. I haven't been able to correct this or reset it since. I have updated the software and re-installed the map, performed a factory reset to no avail. I have GPS satellites showing up on the system, but it always says the GPS signal is weak, no matter where I drive. I can only assume the GPS aerial has been damaged somehow in the vehicle, could anyone have another suggestion of a knowledge of the where abouts of the aeriel within my Mazda 5 venture.