GPS is a classic and deceptively brilliant method to ascertain a spectator's freely selected playing card - done under nearly impossible conditions. NO key cards. NO gimmicks.
They shuffle the the cards not once but TWICE during the demonstration.
You are able to locate their selection 100% of the time. Learn a powerful technique that you can apply to any magic trick you wish, as a way to identify a selected card under truly test conditions.
Industry professional Chris Kenner teaches the concept in full detail - complete with additional applications - in 10 minutes of concise high definition instruction filmed in Las Vegas, Nevada.
"Keep this low profile - it is a miracle for laymen." - Steven, theory11 forums