Our family of apps will happily take GPS data from most Bluetooth GPS devices, however we recommend those with GPS refresh rates of 5Hz or higher and recommend 8-10Hz. Anything lower may not give you the detail required for proper analysis of your driving.
Please note: there are many "GPS" sensors out there and most "wired" ones are designed as accessories to existing products, most often these are dashcams. We are not able to read data from these wired GPS units. Wired GPS units that our apps can read data from are usually connected to a motorsports datalogger like the RaceCapture systems we offer.
What about my my mobile device's onboard GPS?
Most mobile device GPS only refresh at about 1Hz (that is, it reports your GPS location once per second), which is not enough to help properly analyze driving, particularly at autocross and usually still not suitable for race tracks.
Why is once per second not enough?
A little math makes this answer very obvious, at 60 mph, you are travelling at 88 feet per sec. In 2 seconds, your vehicle has moved 176 feet.
Compare to a recommended 10hz (10 samples per second), your vehicle has moved 8.8 feet for every time the GPS records your location. At a minimum 5hz, you've travelled 17 feet per data point. Both resulting in more detailed data to your driving.
In 88 feet at some tracks, you may have cleared a corner completely or the data points gathered are before and after the position of interest.