I plan to get the RaceChrono app primarily with the purpose of performance testing and tuning but I have problems making up my mind what external GPS to get. Most questions seems (naturally) to focus on finding the best GPS for track use and it looks like the Dual get the best rating. However the Garmin seems to be the one that has the upper hand on positioning but at the same time runs at a lower frequency thatn the Dual. My plan is to make like 50-150kmh runs and analyse the loggs. What is the most important parameter selecting GPS for performance testing; high frequency or positioning accuracy?
Thanks
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Disclaimer: RaceChrono's Android version doesn't have build in performance testing features, but you can certainly log your data, and get the performance from looking at the graphs.