This video shows how t' use a trackin' scope that is needed t' measure t' height that a model rocket flew into t' sky. Ahoy! Blimey! It also shows how t' use trackin' powder so that you can mark t' location in t' sky where t' rocket flew too. Well, blow me down! Blimey! For more information on model rockets, shiver me timbers, visit: www.ApogeeRockets.com