The method
How we rate watches
Manual before marketing. Every score on this site is built from the maker's own published documents, which you can check yourself through the links on every product card.
By Mike M. · Updated September 2026
We have not worn, dropped or drowned these watches. Scores come from manufacturer manuals, specification pages, battery tables and press releases, cited on every product card. That is the whole method, stated up front, because the question this site answers is not "which watch felt nicest for a week" but "which watch will still be running in ten years," and the makers' documents are the best evidence for that anyone outside a lab has.
Step 1: how is it powered?
Every product carries one power class. It is the first thing to read, because the power system is the part of a watch that ages fastest and it decides how the watch dies: a lithium cell that cycles every few days, a solar cell that almost never cycles, or a coin cell you replace every few years.
| Power class | What it honestly means |
|---|---|
| Solar, no charger | A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
| Replaceable cell | A replaceable coin cell measured in years. No charging, no electronics to update, and the cheapest thing on the watch to service. |
| Solar GPS | A rechargeable cell topped up by a solar lens. Weeks between charges; the cell still ages like any lithium battery. |
| Rechargeable GPS | A rechargeable lithium cell charged from a cable. Days to a few weeks per charge; the cell ages with every cycle. |
Power class is not a ranking by itself. A rechargeable GPS watch can outscore a coin-cell watch when the mission needs maps. It is the first filter, and it is why best solar watches and how long solar watches last exist as pages.
Step 2: who says so? The evidence hierarchy
Each evidence row on a product card cites the highest source available, in this order:
- The maker's operation guide or manual, for that product only: battery operating time and the usage assumptions behind it, water resistance class, operating temperature, sensor behavior, charging limits. Garmin's owner's-manual battery tables and Casio's module guides are the backbone of the site.
- The maker's specification page or press release: lens material, bezel and case material, weight, dimensions, a MIL-STD-810 line in the maker's own words, warranty terms.
- A published standard the maker names (ISO dive ratings, EN13319, MIL-STD-810 revisions), for what the line proves and does not prove.
- Specialist reporting of a maker's announcement (for example G-Central's transcription of a Casio release), used only for physical specs when Casio's own retail page blocks access, and labeled as such in the source list.
Never used as evidence: Amazon star ratings and review counts, forum posts, other review sites, YouTube drop tests, or any figure we cannot trace to a document. A watch whose lens material the maker does not name is not flagged as sapphire. A number we cannot source is removed rather than guessed, and every page lists its sources at the bottom.
Step 3: the scoring rubric
Every watch on the site is scored 0 to 10 on the same six metrics. The overall score is the weighted average, computed in code from the metric scores so no page can show an overall that disagrees with the breakdown beside it. The weights are set for one buyer: the person who wants to buy a watch once.
| Metric | Weight | What earns points |
|---|---|---|
| Battery & power independence | 25% | Manufacturer-stated hours in GPS mode and days in watch/smartwatch mode; a solar lens, a Tough Solar cell or a multi-year coin cell scores higher than a weekly charger. |
| Durability of materials | 25% | Glass first (sapphire over chemically strengthened glass over mineral), then bezel and case material, a stated MIL-STD-810 build and the water rating. |
| Serviceability & lifespan | 20% | Can the cell be replaced by a user or watchmaker? Are straps standard? How long has the maker kept updating this line, and what does the warranty say? |
| Field usability | 15% | Physical buttons that work in gloves, a backlight or flashlight, legibility in sun, and navigation or maps where the mission needs them. |
| Value per decade | 10% | The launch price set against the service-life class the other metrics imply. A method, not a lifespan number we invent. |
| Mission fit | 5% | Light discipline and stealth for tactical use; sunrise, sunset and moon data for hunting; the bits that only matter to one reader. |
Half the score is power and materials, because those are the two clocks no software update can reset. Step counts, sleep grades and app ecosystems earn nothing; they are the reason to buy a different kind of site's recommendation. Scores are comparable across the whole site: a 7.7 G-Shock and a 7.7 Garmin are two watches we expect to serve a decade equally well for different reasons.
Scores appear on the page only. They are never published as review or rating markup in the page code, because they are editorial judgments built from documents, not test results.
Step 4: how rankings are ordered
A roundup lists products in score order, ties allowed, and each pick note says in plain words why that watch is there. When a lower-scoring watch would be the better buy for the page's reader (a coin-cell watch on a page about night vision, say), the note says so rather than the order pretending otherwise. Every roundup also names what fails first on the watches listed, because a buy-it-for-life page that only lists strengths is an advertisement.
Why you won't see prices
Prices change daily and Amazon sets them. Until a live, date-stamped price feed is connected, every button says "Check price on Amazon" rather than showing a number that could be wrong. When live prices arrive, each will carry an "as of" date and disappear automatically if it goes stale. We do not print prices in prose for the same reason.
How often we re-check
- Battery tables, spec pages and manuals for every listed product: quarterly per roundup, and whenever a maker ships a successor.
- Warranty terms: yearly, and on any announced change.
- Every substantive change gets a dated entry in the page's "Corrections & updates" log.
Independence
We earn affiliate commissions on some links (see the disclosure). Commissions never set a score or decide a pick, no brand pays for placement, and a watch with a better commission doesn't outrank one with better evidence. Spot something wrong? Email mike@blackironathletics.com and we'll check it against the source.