GP Master helps you driving regularity tests in Old- & Youngtimer rallies.

This task is to drive a predetermined route length with exact same average speed. Often, the monitoring of compliance with section carried out by one or more hidden time measurements. Not easy!

Features
+ Simple inputting the target average speed
+ Preliminary editing the next average speed at average exchange
+ Large display for rapid detection of the deviation
+ Optional display choice between displaying the deviation of seconds or distance
+ Symbolic recommendation for speed change
+ Quickstart App
More functions
+ Operation Apple Watch
Request within the app option to a manual.
Good luck with the special stages


"Continued use of GPS running in the background can dramatically decrease battery life."

Image distortions due to further product development or in-app purchases possible