Garmin Forerunner 970 vs Apple Watch Ultra 3: Which Wins in 2026?

Overview

The Garmin Forerunner 970 and Apple Watch Ultra 3 are both premium multi-band GPS watches targeting serious endurance athletes, but they serve different masters. The Forerunner 970 is built for athletes who want deep training analytics, a wide sensor suite, and Garmin's ecosystem. The Ultra 3 is for athletes already in Apple's world who refuse to compromise on smartwatch functionality alongside their training data.

Specs at a glance

Price: Forerunner 970 ~$650 / £599.90; Ultra 3 significantly higher at Apple's flagship tier
GPS: Both use multi-band GNSS with dual-frequency support
Battery (GPS on): Ultra 3 claims up to 60h in low-power mode; Forerunner 970 offers extended GPS mode with firmware-managed battery projections
Heart rate sensor: Both use wrist optical PPG (blood volume via light, not electrical) for HR and HRV
Additional sensors: Both include SpO2 optical, skin temperature, barometric altimeter; Forerunner 970 adds Connect IQ third-party data field support
Display: Ultra 3 uses always-on LTPO OLED with sapphire crystal; Forerunner 970 uses AMOLED touchscreen
Water resistance: Ultra 3 rated to 100m with EN13319 dive certification; Forerunner 970 rated to 10 ATM (~100m) without dive certification
Weight: Ultra 3 at 61g (titanium); Forerunner 970 weight not specified in review data

GPS and tracking accuracy

This category is genuinely complicated, and neither watch dominates cleanly. In controlled track testing against multiple competitors, the Forerunner 970 was beaten by at least one cheaper device on pure GPS accuracy. For a $650 watch, that is a real weakness. At the same time, the 970 performed joint-best in a separate demanding 10-mile London urban course benchmark run by The5kRunner, matching the Ultra 3's performance on that route.

The Ultra 3 beat the Garmin Fenix 8 Pro in every category in a dedicated satellite and connectivity comparison, which is a strong result given the Fenix 8 Pro is Garmin's own flagship. However, the Ultra 3 had its own accuracy struggles on that same challenging London course where the 970 performed well. Multi-band GNSS on either watch does not guarantee perfection in dense urban environments.

Verdict on GPS: The Ultra 3 has a slight edge in satellite acquisition and connectivity benchmarks. The 970 holds its own on road and trail. Neither watch is immune to urban GPS drift.

Battery life

The Forerunner 970 is the clear winner here for endurance use. Garmin's extended GPS mode and battery manager tools give athletes real-world projections they can plan around. Firmware 16.28 improved battery transparency, which matters for ultramarathon and long triathlon planning.

The Ultra 3 claims up to 60 hours in low-power mode, but real-world GPS-on endurance sessions will be considerably shorter than that ceiling. For anything beyond a 24-hour event, the Forerunner 970 is the more practical choice. For standard marathon or Ironman distances, both are adequate.

For athletes: who wins?

Road running: Forerunner 970. Deeper running dynamics, Connect IQ ecosystem, and training load tools built specifically for runners.
Trail and ultramarathon: Forerunner 970. Battery life advantage and Garmin's trail navigation tools are better suited to long efforts in the field.
Triathlon: Forerunner 970. Purpose-built multi-sport modes and the depth of Garmin's triathlon analytics are not matched by the Ultra 3.
Recovery and daily health tracking: Ultra 3, for anyone in the Apple ecosystem. Seamless iPhone integration, strong daily smartwatch utility, and a large bright always-on display make it more practical as an everyday device.

Verdict

For serious runners and triathletes, the Forerunner 970 is the better training tool. Its depth of analytics, battery life for long events, and Connect IQ support justify the price for athletes who train by data. The GPS accuracy concerns from track testing are real but not disqualifying given strong performance in other environments.

The Ultra 3 is the better watch for athletes who live in Apple's ecosystem and want a capable GPS watch that also functions as a full smartwatch. It edges the 970 on satellite benchmarks and daily wearability, but falls short on training-specific depth and battery endurance.

Buy the Forerunner 970 if you are a performance-focused runner or triathlete who wants the best training platform. Buy the Ultra 3 if you are an Apple user who trains seriously but also wants the best smartwatch experience money can buy.