Navigation questions

Hi.

I have been tinkering with this and I just don't seem to be able to figure it out. Let's say I set my destination and I take off heading towards that destination, is there a way to see what the ensuing/future steps the navigation system has planned for the trip? In other words, I'm cruising along, I'd like to know what the path it intends to have me follow is.

Also, let's say that I'm heading to point A, but I need to find a gas station first. I know that I can do a waypoint, but I did that the other day and then decided to not go to the waypoint, but I couldn't figure out how to get it to cancel the trip to the gas station and continue on with my trip to point A. I ended up cancelling the whole thing and starting it again.

Last question... from time to time, I think the navigation system reboots itself. Is this highly unusual from your experience?