Modern mobile phones and tablets are highly advanced and very rugged electronic devices, engineered to withstand tremendous abuse by the average consumer. Racepak’s D3 app utilizes the extraordinary processing power, high-resolution display, and internal wireless capabilities of mobile devices to deliver the most advanced system on the market. A vehicle-mounted D3 app-equipped mobile phone functions as a wireless receiver for the CL1 or CL2 data box sensors, data recorder, on-track instrumentation, and data analysis device, and when cellular is activated, automatically uploads all data to the user's Racepak cloud account for real-time or post-run outing data review.