In order to be "open carry", it would have to be readily visible to anyone looking into the vehicle, say, in a holster on the dash (we did this one in High School a lot) or in a window rack for a rifle. On the seat would be good too, as long as it wasn't under a newspaper or something. In a glove box would be okay as long as the box was locked, i.e., not "readily accessible to the person..."
Exactly what I was looking for...thanks.