The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
Masure the speed of GPS and record a variety of acceleration time.Provide the aids, such as compass, map, etc..Provide the voice control function. PS:1. Please wait a minute; let GPS to detect enough satellites.2. Please use the iPhone/iPad with GPS included.3. The speed's accuracy depends on the performance of GPS. There might be error for the speed and only for reference.