Umm....what exactly would you like to scan....Trevor Thom says a bit about this.
When looking out never keep your eyes still....you must be looking at all parts of the sky all the time....even if its only for other traffic and not for ground features. Head down time should be kept to a minimum. Scan the map (always keep the map pointing the way you are going it makes things easier
). And just go over the instruments on the way back up...thats how i do it. Oh and a FREDA check now and then.
Hope that helps
Tom