thanks for all replies so far and the page's to look at !
The situation was we were 3rd or 4th in the que to take off from a busy international airport (in the ME) which has two tower frequencies, we normally transmit on box one, first tower frequency said " monitor ---:--- " and I changed box 1 to that frequency ( I thought it means change to but don't transmit, they know you've been handed over and will call you when they want you to line up), but the skipper said no it means listen to that frequency on box two while keeping the first freq on Box 1, what would be the point in doing that ?
Who's right ?