GPS Rally Computer 5.3.1

The GPS Rally Computer is a universal application that serves to streamline the calculations required for navigating traditional time-speed-distance (TSD) automobile rallies. Its design and functionality adhere closely to the specifications put forth by Clarence Westburg and Rich Bireta, collectively referred to as the Simple Rally Computer (SRC). A comprehensive User's Manual is accessible on the app detail page at the official website.

TSD rallies consist of multiple stages mapped out through written instructions, with the initial phase dedicated to calibrating participants' odometers against that of the Rally Master during the Odometer Check stage. Subsequent stages mandate maintaining an average speed, which can shift unexpectedly along the route.

The application leverages Apple's GPS capabilities or connects via Bluetooth to third-party devices for accurate odometer readings, facilitating adherence to precise speed regulations. Below are some of its key features:

• Clock functionality measured in minutes and seconds, including tenths of a second or decimal minutes to thousandths.
• 24-hour clock format for simplified calculations.
• Distance readings can be displayed in miles or kilometers at varying precisions.
• One-click reset option to return to default conditions for rally initiation.
• Internal clock adjustable to synchronize with the official rally clock.
• Option to add the distance between the GPS receiver and the measurement point on the vehicle for increased accuracy.
• A "sprocket" button in the top menu provides quick access to application settings while in use.
• Calibration of the car's odometer against the official rally odometer is facilitated through a convenient popup.
• Ability to adjust average speed (CAST) via a custom popup keypad.
• Preselection of speeds for upcoming stages simplifies transitions between different CASTs and allows easy resets to zero for transit zones.
• Real-time comparison of actual speed against expected speed, displaying any deviations with indications of being "Early" or "Late".
• Time error display options selectable within app settings.
• Features for pausing time, gaining time, or applying allowances during transit zones.
• A reverse function allows users to correct off-course errors in time and distance.
• A split function enables recording of time and error values at any moment during the rally.
• Control options allow resetting of time error and distance while advancing the next starting time incrementally.
• Next CAST can be set with a countdown clock facilitating automatic or manual overrides.
• Compatibility with dual GPS receivers via Bluetooth enhances positional accuracy.
• The app connects seamlessly with the TSD Remote app for an integrated driver display through local networks.

It is important to note that utilizing the GPS Rally Computer during rallies is contingent upon adherence to the specific rules laid out by event organizers, which may influence categorization and class participation. Certain events may even restrict the use of this application.

This app has been effectively tested using Bluetooth connectivity with a Dual XGPS150A Universal GPS Receiver. However, users should be aware that prolonged operation of GPS services in the background can significantly impact battery performance.