No, the GC3 does not require a subscription. It comes with a free one-year subscription to the FSX Pro app, which includes access to a variety of features, such as:
- 3D driving range
- Virtual courses
- Custom practice drills
- Data analysis
After the first year, you can choose to renew your subscription or continue using the GC3 without a subscription. If you choose not to renew your subscription, you will still be able to use the GC3 to track basic data points, such as clubhead speed, ball speed, launch angle, and spin rate. However, you will not be able to use the more advanced features of the FSX Pro app.