Apple Watch Ultra 3 Beats Garmin Fenix 8 Pro in Satellite Connectivity

Apple Watch Ultra 3 outperforms the Garmin Fenix 8 Pro across every satellite and connectivity metric tested by The5kRunner. That is a significant finding, given the Fenix 8 Pro sits at around $900 and has long been the benchmark for GPS accuracy in endurance sports.

The Fenix 8 Pro uses multi-band GPS with support for GPS, GLONASS, Galileo, and BeiDou. Solid on paper. The Ultra 3 runs the same multi-band setup but appears to lock faster, hold signal better in tree cover and urban canyons, and produce cleaner tracks on technical trail routes.

Connectivity beyond GPS also matters for athletes racing or training with live tracking. The Ultra 3 brings cellular connectivity natively, meaning you can ditch your phone on long runs and still push data or take calls. The Fenix 8 Pro has no LTE option at all, which is a real gap for solo athletes doing remote ultras or gravel rides.

Where the Fenix 8 Pro still holds ground is battery life and the broader training ecosystem. You get up to 48 hours in GPS mode versus roughly 60 hours on the Ultra 3 in low-power GPS, but the Garmin pulls ahead on full multi-band sessions. Garmin's training load, recovery, and running dynamics metrics also remain deeper than what Apple offers natively.

Verdict: if raw satellite performance and cellular connectivity are your priorities, the Ultra 3 wins this round clearly. If you live inside Garmin's training data ecosystem and need longer battery on ultras, the Fenix 8 Pro still earns its place.