Garmin Instinct 3 vs COROS Pace 3: Which GPS Watch Wins?

Overview

The Garmin Instinct 3 is a rugged, military-grade GPS watch built for outdoor adventurers and endurance athletes who need durability and long battery life in demanding environments. The COROS Pace 3 is a featherlight training tool aimed at serious runners and ultramarathon competitors who want multi-band GPS accuracy at a budget-friendly price. The core trade-off is toughness and ecosystem depth versus weight savings and cost.

Specs at a glance

Price: Garmin Instinct 3 £350-£450 vs COROS Pace 3 ~£170 (€199)
Weight: Garmin 48g vs COROS 30g
GPS battery life: Garmin MIP Solar up to 48h (40h without solar), AMOLED 30h vs COROS 38h standard, 20h multi-band
GPS chipset: Both multi-band GNSS (GPS, GLONASS, Galileo, BeiDou)
Heart rate sensor: Both wrist optical PPG with HRV tracking
SpO2: Both included
Skin temperature: Garmin AMOLED variant only; absent on Garmin MIP and COROS Pace 3
Durability: Garmin MIL-STD-810, 100m water resistance vs COROS 5 ATM (50m)

GPS and tracking accuracy

Both watches use multi-band GNSS and deliver a meaningful accuracy step up over single-band devices. The COROS Pace 3 holds clean track lines in forest switchbacks and urban canyons where cheaper single-band watches from Garmin's own Forerunner 55 and Polar's entry-level lineup drift by 5 to 10 percent. The Instinct 3 matches that standard in open terrain and locks on quickly, performing comparably to the Apple Watch Ultra 2 in standard conditions.

Where the Instinct 3 loses ground is onboard navigation. It has no topographic maps on the device. Rivals at similar or lower prices, including some COROS models, offer full topo maps. For trail runners who need turn-by-turn navigation in the field, this is a real gap. The COROS Pace 3 is not a navigation powerhouse either, but at its price the absence is more forgivable.

Battery life

The Garmin Instinct 3 MIP Solar is the clear battery leader when you factor in solar charging. Up to 48 hours in GPS mode with solar assist, and up to 150 hours in expedition mode, makes it viable for multi-day fastpacking without a charger. Without solar, the MIP model still delivers around 40 hours of GPS. The AMOLED variant drops significantly to 30 hours GPS, which undercuts its own sibling.

The COROS Pace 3 offers 38 hours in standard GPS mode and 20 hours in full multi-band mode. For most single-stage ultras and 100-mile races that finish inside 30 hours, it covers the distance. But for multi-day events or athletes who charge infrequently, the Instinct 3 MIP Solar has a real advantage.

For athletes: who wins?

Road running: COROS Pace 3. At 30g it disappears on your wrist during long efforts, and multi-band accuracy is excellent for pace and distance data at a fraction of the Instinct 3 price.
Trail and ultramarathon: Garmin Instinct 3 MIP Solar for multi-day events where battery matters most. COROS Pace 3 for single-stage efforts under 30 hours where weight is the priority. Neither offers strong onboard topo maps.
Triathlon and swim: Garmin Instinct 3. The 100m water resistance and MIL-STD durability rating give more confidence across open water and rough conditions than the COROS 5 ATM rating.
Recovery and HRV tracking: Garmin Instinct 3, marginally, for the broader ecosystem of body battery, stress tracking, and sleep analytics. The COROS Pace 3 tracks HRV but the Garmin platform ties more data points together.

Verdict

For most runners, the COROS Pace 3 wins on value. It delivers multi-band GPS accuracy comparable to the Instinct 3 at less than half the price, in a package that weighs 18g less. That is a significant combination for anyone whose primary use case is running and training load management.

Buy the Garmin Instinct 3 MIP Solar if you do multi-day adventures, need MIL-STD durability, or want solar charging to eliminate mid-trip top-ups. Buy the COROS Pace 3 if you are a runner or triathlete on a budget who wants accurate data and long battery life without paying for ruggedness you will never need.