When I purchased this product, I did not know you had to buy map updates. I downloaded all items that were free from[...]. However, the GPS often makes mistakes and I do not understand this. In certain areas, it does not work. It boggles my mind when I put in a Hospital for instance and it takes me to an empty field. Or, it takes me past the address I want. I am confused and perplexed. Am I supposed to buy map updates? There was no manual, so I do not know. Can anyone help me understand? [...] Thanks, Sam