tcSpeeds is a comprehensive speed measurement and navigation tool designed for iPhone and GPS-equipped iPads. It offers features such as measuring current speed, average speeds, maximum speed, directional speeds, velocity made good, and wind measurements. The app also includes a proprietary Pilot Performance Index (PPI) computation for assessing performance on a straight course. Users can compare their control skills with friends or autopilot systems.

tcSpeeds operates independently without requiring external hardware or connections, utilizing the device's internal GPS, accelerometers, and compass. Additional sensors like the Calypso Ultrasonic Wind sensor can be integrated for wind measurement. The app is user-friendly, requiring zero setup - simply install, launch, and start using the various features for enhanced navigation and speed tracking.