At this point, you must already have your North Korean visa issued. Your visit has been approved by the Party, and you have designated guides assigned. And here's a North Korean customs declaration form. We only got one for the whole group, and, outsmarted by the rest of us, I was forced to fill it in.
It mentions GPS. My camera doesn't provide geo-tagging, but it does have a GPS entry in the menu, in case I'd like to attach a GPS unit. When a North Korean customs officer saw that in the camera menu, she grew very suspicious of my camera and wouldn't let go of it, even though every time she left our carriage (the checks on your way in are done inside the train) we tried to hide it in various places.