bigbuffs

OK im new here and i have been looking around the site for a while trying to get some ideas/answers. I have a few questions and would appreciate any help that can be given.

Regarding streedeck
I have downloaded the trail software and I like the program but i have some questions 1)does running the gps on streetdeck require some type of usb antenna to link to gps satellites? 2)Same question for the radio, can the streedeck get local radio channels and does it require some type of antenna connection?

About setup
What is the best way to connect the PC? is it better to run it through an in dash reciever or go through a diiferent LCD screen? What type of connection is used to connect video? I know most in dash units don't have a vga connection. Is it possible to bypass the in dash reciever and hook into the car stereo speakers and still get good sound quality?

Also what is the best way to power the unit? Are there power supplies that will shutdown the computer and turn it on automatically when the ignition is stared? Does it take a long time for the computer to start up? Is it hard on the computer turning on?off all the time.

Last one. Does the computer hold up well to changing weather conditions i.e. below freezing temps in the winter and very hot in the summer?

Thanks everyone for your help!