Garmin Forerunner 570

What you give up, and what you do not

Garmin publishes the 570 as available in 42 mm and 47 mm, with an AMOLED display, multi-band GNSS, a speaker and microphone, on-watch music, and up to 11 days smartwatch or 18 hours GPS on the 47 mm case.

What you do notgive up is the data. The 570 uses the same generation of optical sensor and the same class of multi-band receiver as the 970. The numbers it records are not a cut-down version of the flagship's. That is the single most useful fact about this watch and the reason it is the sensible default for most runners.

What you give up is maps, the titanium bezel, the ECG app, and eight hours of stated GPS endurance.

The battery is the real decision, not the maps

People frame this choice around mapping, but maps are a feature most runners use twice. The constraint that actually bites is endurance. Eighteen stated hours is comfortable for a marathon with an enormous margin and thin for anything beyond about twelve hours of moving time.

And per hour it is the worse deal: $30.33 against the 970's $28.85. That is a genuinely counter-intuitive result and it is why we compute these figures rather than describing watches as offering "good value".

The 42 mm option deserves more attention than it gets. A 47 mm case on a small wrist is not a cosmetic problem — a sensor that does not sit flat measures worse, which makes case size a data-quality question rather than a styling one.

What we could not verify

• Heart-rate accuracy. No independent validation of this watch that we could find.
• Positioning accuracy in the field. Same gap as the 970 — the useful peer-reviewed study is from 2020 and tested single-band hardware.
• The 42 mm battery figure.Garmin's published 18-hour GPS number is for the 47 mm case. Smaller cases carry smaller batteries; we have not seen a confirmed figure for the 42 mm and are not going to estimate one.

Who should not buy it

Anyone racing beyond about twelve hours, and anyone who navigates unfamiliar trails. Breadcrumb navigation without a map is workable in principle and unpleasant in practice when you are tired and it is getting dark. If that describes you, the rugged flagship is the comparison worth reading — Forerunner 570 vs fēnix 8 matches every GNSS mode properly, which most spec tables of those two do not.

Update: the 42 mm figures, and the cross-brand comparison

As of our 20 September 2026 read, Garmin's product page lists the 42 mm case separately: up to 10 days in smartwatch mode, 18 hours GPS-only, 14 hours SatIQ and 13 hours All-Systems + Multi-Band, at 42 g. The 47 mm case is stated at 11 days, 18, 16 and 14 hours, at 50 g. Those are the 42 mm figures the launch-day text above declined to estimate, read from Garmin's own page rather than guessed, and they close the gap in the honest direction: the small case gives up one multi-band hour, not several.

The question most 570 shoppers actually type is not 570-versus-970 but whether to leave Garmin altogether for the watch that states 41 GPS hours at about half the money. That is resolved, mode by mode, on Forerunner 570 vs COROS PACE 4.

Update: the watch at the same price that is not a Forerunner

Garmin lists the Venu 4 at the same $549.99 as this watch, and — this surprised us — its own owner's manual documents that watch with the Forerunner analysis stack and states a longer battery in every published mode, including 17 hours in all-systems multi-band against the 570's 14. Both tables are printed in full on Forerunner 570 vs Venu 4, and the device write-up is the Venu 4 review. What the 570 keeps is the SatIQ mode and the running line's tooling, which is the honest case for it.