In the Battle of Britain, victory depended on knowing not just where your enemy was, but where your own fighters were in the vast skies above.

Enter Pip-Squeak, a clever ticking lifeline that let groundcrews track aircraft with surprising precision. Paired with the trusty—but increasingly outdated—TR 9 radio, it kept Fighter Command connected through the chaos of battle.

This is the Untold Story of one of the technologies that helped win Britain’s most crucial aerial battle to date.

Untold Stories is a series of short films, narrated by our own experts, that uncover the remarkable lesser-known stories of the Battle of Britain while spotlighting the people, tactics, and technology brought to life through the RAF Museum’s collection.

Keep an eye out for Episode 5 when we examine how a simple tablecloth tells the history of the Battle of Britain’s most prolific squadron, 303 Squadron.