I've been using this link
DJI Flight Log Viewer - Phantom Help to upload my data, which can then be viewed online, or a far more detailed set of metrics can be downloaded from there in a CSV file. You will find instructions there on how to use iTunes to access the Go4 Flight Records, and copy these over to your local computer, for upload as above, or there are other sites, such as
Airdata UAV - Flight Data Analysis for Drones where you can get details also. There is also a windows app, which is in beta still, available via a link from another forum member here... his name escapes me just now...
Hope this helps.