A system, method and computer application to log signal egress (leakage signal) readings from a test instrument during a “walkout” mode where the technician and test instrument have left a vehicle and troubleshooting is being performed on foot. A unique troubleshooting and discovery dataset is created and capable of revealing problems not previously discoverable using vehicle mounted test instruments. In addition, the dataset may be used for quality control and other purposes such as e.g., providing a report or mapping of the path the technician used during the troubleshooting process. Augmented reality features may also be displayed on the technician's mobile device to facilitate finding the source of one or more leaks.