Personally i also believe this 0013 thing and others is a waste of time......
Be conspicuous with alt etc def its good for practicing height keepin But listening in on a freq who will not even entertain letting you across seems pretty much pointless skirt round know yr airspace and see and avoid....
Also as has been seen in other threads, it has created more problems than solved any....
Perhaps you would be good enough to point me at the negative threads regarding the use of 0013? I am tasked with compiling a review of the trial and have only had positive comments about the scheme, so far.