A GPS navigation device with a large touchscreen. TomTom’s all-in-one GPS navigation devices all include a touch screen, speaker, USB port, and an internal Lithium-ion battery.
I had a similar problem and did 2 things. 1. Hold down power button for20 seconds and see what happens. That usually resets everything. 2 . Go to the website and refresh everything, it has a program to pick up gps quicker.
1 
