Hello, Do you mean you want to use your original car's GPS antenna?If yes, you need to connect one GPS adaptor since your original car's GPS antenna can not plug directly into our unit.
Yes, we have GPS map for North America.We can provide map update freely and you can also download maps on the Internet. Our unit support IGO,Tomtom, Route 66,Papago etc.
We are sorry that this unit does not come with the removal tools.If you need one, you can buy on our website.The following one is for your reference:
http://www.seicane.com/car-parts-accessories/dvd-dismantling-device
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Seicane