Garmin Forerunner 170 vs Polar Vantage V3: Which GPS Watch Wins?

Overview

The Garmin Forerunner 170 is a $299.99 mid-range running watch for recreational runners who want Garmin's full physiological tracking suite on an AMOLED display without spending flagship money. The Polar Vantage V3 is a $599 serious training tool built for endurance athletes who need proven GPS accuracy, deep recovery metrics, and triathlon-grade durability. These two watches are not really competing for the same buyer.

Specs at a glance

Price: Forerunner 170 at $299.99 vs Vantage V3 at $599
Display: Both AMOLED; Vantage V3 is 1.39-inch with confirmed always-on option
GPS: Forerunner 170 chipset unconfirmed; Vantage V3 multi-band, multi-constellation (GPS, GLONASS, Galileo, QZSS)
Battery (GPS mode): Forerunner 170 unconfirmed; Vantage V3 up to 43 hours GPS with optical HR active
Battery (power-save GPS): Forerunner 170 unconfirmed; Vantage V3 up to 140 hours
Weight: Forerunner 170 unconfirmed; Vantage V3 at 55 grams
Water resistance: Forerunner 170 unconfirmed; Vantage V3 rated 100 meters (10 ATM)
Sensors: Both include wrist optical PPG heart rate, HRV, SpO2, skin temperature, barometric altimeter

GPS and tracking accuracy

The Vantage V3 has a verified, tested multi-band GNSS implementation. In back-to-back comparison runs against a Garmin Fenix 7 Pro, distance deltas rarely exceeded 0.05 miles over a 10-mile effort. Pace data during interval work shows lag under two seconds. That is real-world data from hands-on testing.

The Forerunner 170's GPS chipset is unconfirmed at time of writing. Whether it uses multi-band or single-band GNSS has not been verified in available sources. No real-world accuracy figures exist yet. Writing comparative numbers here would be fabrication. If GPS precision matters for your training, the Vantage V3 is the only one of these two watches with a proven track record right now.

Battery life

The Vantage V3 delivers 43 hours in full GPS mode with optical heart rate running, and up to 140 hours in power-saving GPS mode. That covers ultramarathons, full Ironman events, and multi-day adventures without a charge. Smartwatch mode lasts approximately 7 days.

The Forerunner 170's battery life has not been confirmed in available sources. Given its mid-range positioning and AMOLED display, expect something in the range of 20 to 30 hours in GPS mode based on Garmin's current lineup patterns, but that is an estimate, not a verified figure. The Vantage V3 wins this category by default until real numbers exist for the Forerunner 170.

For athletes: who wins?

Running (recreational): Forerunner 170, assuming GPS performance proves adequate at launch. The price is right and Garmin's software ecosystem is mature for everyday runners.
Trail and ultrarunning: Vantage V3. Multi-band GPS under tree canopy, 140-hour power-save GPS mode, and 10 ATM water resistance make it the credible choice for long efforts in rough conditions.
Triathlon: Vantage V3. It is purpose-built for multisport. 100-meter water resistance, multi-band GPS, and proven optical heart rate accuracy during steady-state aerobic work give it the edge. The Forerunner 170 has no confirmed triathlon credentials yet.
Recovery tracking: Vantage V3. Continuous nightly SpO2 logging, HRV measurement, and Polar's established recovery intelligence tools are tested and functional. The Forerunner 170's physio stack is described but unverified in practice.

Verdict

The Polar Vantage V3 is the clear recommendation for any serious athlete. Its GPS accuracy is proven, its battery life is documented, and its sensor suite has been validated through real-world testing. At $599 it costs twice as much as the Forerunner 170, but it delivers twice the confidence in the data. The Forerunner 170 may well be a solid mid-range option once hands-on reviews arrive, but right now it is an announcement, not a tested product. Buy the Vantage V3 if you train hard and need reliable data. Wait for independent reviews of the Forerunner 170 before spending $299.99 on unverified specs.