It does help a little thanks.
I am having a foggy brain day.

So if I decided on a night trip at 2500ft I can maintain this altitude for the whole trip irrespective of heading due to being below transition altitude ?
Don't know why I am asking this as it's something I know but cannot remember at the moment, the embarrassment of it.
Going to get the books out when I get home. Ever had one of those days ?