Question about Hitec Eco Car

THE runabout, but only for the flat? According to the English user manual, moisture, dust, temperatures below freezing, road salt, etc. damage the car. So is it only allowed to drive around indoors? Is an outside parking space therefore taboo? What happens if the car is driven in the rain or even in winter? Short circuit? Leakage current? According to the instructions, dirt, salt, etc. must be washed off the underbody with water as quickly as possible. What now? Can it get wet after all? Or do I have to crawl under the car afterwards to dry it? The "GPS navigation" can only be used with a smartphone that transmits the data via Bluetooth. Is there no GPS card included in the delivery? Can I only use the navigation system if I have a smartphone?