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Running and outdoor watches: what the specs mean
Running and outdoor watches: what the specs mean: a buying reference built on published validation rather than reviews: multi-band GNSS and what the…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
A buying reference built on published validation rather than reviews: multi-band GNSS and what the accuracy studies show in forest and city, wrist optical heart rate against a chest strap and the conditions where the wrist fails, sleep staging measured against polysomnography, and the plain statement that readiness, body-battery and stress scores are vendor models, not measurements. ~14 item pages covering battery in true GPS mode, barometric against GPS elevation, SpO2 and ECG features and their regulatory status, maps and routing, getting your data out in FIT/GPX, strap irritation, and buying last year's model.
How to use it
Use Running and outdoor watches: what the specs mean to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | jooksukell gps täpsus |
| Finnish | rannesyke vai sykevyö |
| Russian | точность gps в часах для бега |
| English | is wrist heart rate accurate for intervals |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: published GNSS accuracy and wearable validation studies (cited), the Garmin FIT SDK and GPX schema (public), manufacturer published specifications (cited per model). · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
the apex watch guides connect a watch you already own; this chooses one and decodes the spec sheet.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Hrv
Continue to the related TempoLife reference.
Vitals
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Gadgets
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Racetimes
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Why it belongs on TempoLife
/hrv, /vitals, /gadgets, /racetimes.
Frequently asked questions
What does this guide cover?
A buying reference built on published validation rather than reviews: multi-band GNSS and what the accuracy studies show in forest and city, wrist optical heart rate against a chest strap and the conditions where the wrist fails, sleep staging measured against polysomnography, and the plain statement that readiness, body-battery and stress scores are vendor models, not measurements. ~14 item pages covering battery in true GPS mode, barometric against GPS elevation, SpO2 and ECG features and their regulatory…
What evidence does it use?
published GNSS accuracy and wearable validation studies (cited), the Garmin FIT SDK and GPX schema (public), manufacturer published specifications (cited per model).
Where does this guide stop?
the apex watch guides connect a watch you already own; this chooses one and decodes the spec sheet.
Turn the reference into a routine
TempoLife brings food, movement, sleep and everyday health habits into one private place when you want to track what happens next.