Built to Last / The rankings
The best ABC watches: seven altimeter-barometer-compass watches that never record a track and never need a charger
An ABC watch measures the world instead of recording it, and most of them run on light or a coin cell for years. Ranked on the accuracy figures the makers publish, the power system, and the case, from Casio's and Suunto's own documents.
By Mike M.Updated Spec-sheet researched, not worn by us
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Quick picks
The rankings at a glance
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 |  G-Shock Rangeman GW-9400 ±10° compass, ±3 hPa pressure, altitude to 10,000 m, sunrise/sunset, Tough Solar, radio time, 200 m, mud seals. | Best ABC watch overallSolar, no charger | 8.7 /10 | Check price · Amazon |
| 2 | G-Shock Mudmaster GWG-2000 Same published accuracy under sapphire on forged carbon; 106 g. | Best ABC watch with sapphireSolar, no charger | 8.7 /10 | Check price · Amazon |
| 3 | G-Shock Mudman GW-9500 Duplex LCD draws the compass and pressure pointers; 81 g, 200 m. | Best ABC displaySolar, no charger | 8.2 /10 | Check price · Amazon |
| 4 | Casio Pro Trek PRW-61 62 g, solar, five radio signals, ±10° / ±3 hPa; 100 m. | Best light ABC watch with radio timeSolar, no charger | 8.1 /10 | Check price · Amazon |
| 5 | Casio Pro Trek PRG-340 Triple Sensor v3, solar, 54 g, 100 m; no radio time. | Best budget ABC watchSolar, no charger | 8.0 /10 | Check price · Amazon |
| 6 | Suunto Core Alpha Red NVG backlight, compass with declination, 12-month CR2032; 30 m. | Best ABC watch for night visionReplaceable cell | 7.5 /10 | Check price · Amazon |
| 7 | G-Shock Mudmaster GG-B100 Quad sensor with step counter, Bluetooth, two-year coin cell, mineral crystal. | Best ABC watch with phone syncReplaceable cell | 7.5 /10 | Check price · Amazon |
#ad · Prices are set by Amazon and change often, so we don't print them. Scores are ours, built from the makers' manuals, battery tables and spec pages, not field tests. Photos are illustrative stock. Tap a row for the full write-up.
What an ABC watch is
Altimeter, barometer, compass: a pressure sensor read two ways plus a magnetic sensor. No GPS receiver, so no track and no map, and no receiver to power, so a battery measured in months or years. With a paper map it is a complete navigation kit; without one it is a bearing, a weather trend and an altitude. The sensors are explained on ABC watch explained, and the case for an ABC watch over a GPS watch is on GPS vs ABC for hunting.
Published accuracy, side by side
| Watch | Compass | Pressure | Altitude range | Source |
|---|---|---|---|---|
| Rangeman GW-9400 | Within ±10° | Within ±3 hPa (altimeter ±75 m) | -700 to 10,000 m | Casio module 3410 guide |
| Mudmaster GWG-2000 | Within ±10° | Within ±3 hPa | 30-record altimeter memory | Casio module 5678 guide |
| Mudman GW-9500 | 0–359° | 260–1,100 hPa | -700 to 10,000 m | Casio module 3553 guide |
| Pro Trek PRW-61 | Within ±10° | Within ±3 hPa (altimeter ±75 m) | Altimeter with memory | Casio module 5673 guide |
| Pro Trek PRG-340 | Triple Sensor v3 | Triple Sensor v3 | — | G-Central report of Casio's announcement |
| Suunto Core Alpha | Adjustable declination | Barometer, weather trend | Altimeter | Suunto product page |
| Mudmaster GG-B100 | Compass | Altimeter/barometer | — | G-Central spec sheet |
Casio is the only maker here that publishes accuracy figures in its guides; Suunto publishes the sensor list. Casio also states the temperature range in which accuracy is guaranteed (10 to 40°C for direction on the PRW-61 and GWG-2000) and that strong impact lessens precision. A ±10° compass is a bearing to walk, not a survey instrument, on every watch here.
Solar or coin cell
Five of the seven are Tough Solar: Casio's guides rate the Rangeman about 8 months and the Mudmaster, Mudman and PRW-61 about 6 months in the dark, and the PRG-340 7 months used or 27 in power save. The Core Alpha runs up to 12 months on a CR2032 and the GG-B100 about two years on a CR2025. Sensor use costs power on all of them; Casio's operating times assume 20 compass readings and one climb a month. A solar watch just recharges; a coin-cell watch shortens its year. That is why solar leads the ranking, and it is explained on how long solar watches last.
Case, water and weight
| Watch | Water | Crystal | Weight | Radio time |
|---|---|---|---|---|
| Rangeman GW-9400 | 200 m, mud | Mineral | 93 g | Multi-Band 6 |
| Mudmaster GWG-2000 | 200 m, mud | Sapphire | 106 g | Yes |
| Mudman GW-9500 | 200 m, mud | Mineral | 81 g | Multi-Band 6 |
| Pro Trek PRW-61 | 100 m | Mineral | 62 g | Yes |
| Pro Trek PRG-340 | 100 m | Mineral | 54 g | No |
| Suunto Core Alpha | 30 m | Mineral | 67 g | No |
| Mudmaster GG-B100 | 200 m, mud | Mineral | 92 g | No (Bluetooth) |
When you need GPS instead
When you need to know where you have been, not just where you are facing: new ground, a long walk out in the dark, a marked point to return to. The Garmin Instinct 3 Solar has the ABC sensors and a GPS receiver, and the trade is a sealed lithium cell; see G-Shock vs Garmin Instinct.
The mistake buyers make
Not calibrating the compass and not setting a reference altitude. Casio's guides describe a two-point calibration and a declination correction; do both after any magnet exposure. Set the altimeter at a known elevation at the trailhead every trip. An ABC watch is only as good as its last calibration.
The decade pick
In detail
The picks, in full
Rank 1
Stock photoBest ABC watch overall
G-Shock Rangeman GW-9400
±10° compass, ±3 hPa pressure, altitude to 10,000 m, sunrise/sunset, Tough Solar, radio time, 200 m, mud seals.
EvidenceResearched · not worn by us
| Power class | Solar, no charger. A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
|---|---|
| Battery (cell) | Approximately 8 months from full charge to Level 4 with no light (Casio's stated usage conditions) |
| Power | Solar panel and one rechargeable battery (Tough Solar) |
| Glass | Mineral crystal |
| Water rating | 200 meters |
| Sensors | Digital compass, barometer, altimeter, thermometer; sunrise/sunset; Multi-Band 6 time calibration (WWVB, DCF77, MSF, JJY, BPC) |
| Weight | 93 g |
| Size | 55.2 × 53.5 × 18.2 mm |
| Operating temp | Low-temperature resistance -10°C (14°F) |
How the 8.7 score breaks down
- Battery & power independence (25%)
- 10
- Durability of materials (25%)
- 7
- Serviceability & lifespan (20%)
- 10
- Field usability (15%)
- 7
- Value per decade (10%)
- 10
- Mission fit (5%)
- 8
What the spec sheet supports
- Solar and atomic: it sets itself from a radio signal and never sees a cable.
- A module that has been in production for over a decade; parts, straps and bezels are everywhere.
- Sunrise/sunset on the watch, the one hunting feature the Garmin Instinct does without a phone.
Where it falls short
- Mineral crystal, not sapphire; the Rangeman lives behind a raised bezel for a reason.
- No GPS, no maps, no heart rate. It tells you where north is, not where you are.
- Big and thick at 18.2 mm.
Skip this if…
…you want a track of where you walked; an ABC watch measures the world, it does not map it.
#ad · Price set by Amazon · Disclosure for the link to G-Shock Rangeman GW-9400
Rank 2
Stock photoBest ABC watch with sapphire
G-Shock Mudmaster GWG-2000
Same published accuracy under sapphire on forged carbon; 106 g.
EvidenceResearched · not worn by us
| Power class | Solar, no charger. A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
|---|---|
| Battery (cell) | Approximately 6 months with no light (Casio's stated usage conditions) |
| Power | Solar panel and one rechargeable battery |
| Glass | Sapphire with anti-glare coating |
| Bezel & case | Carbon Core Guard case; forged carbon, resin and stainless steel bezel |
| Water rating | 200 meters; shock resistant; mud resistant |
| Sensors | Digital compass, altimeter, barometer, thermometer; radio time calibration (JJY, WWVB, MSF, DCF77, BPC) |
| Weight | 106 g |
| Size | 61.2 × 54.4 × 16.1 mm |
How the 8.7 score breaks down
- Battery & power independence (25%)
- 9
- Durability of materials (25%)
- 10
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 7
- Value per decade (10%)
- 7
- Mission fit (5%)
- 8
What the spec sheet supports
- Sapphire on a G-Shock: the glass that stops the usual first failure.
- Forged carbon bezel and a carbon monocoque case.
- Solar and atomic like the Rangeman.
Where it falls short
- At 106 g and 61 mm wide it is the heaviest watch on this site.
- Analog-digital display: harder to read at a glance than a pure digital.
Skip this if…
…you have a small wrist or wear a cuff over your watch.
#ad · Price set by Amazon · Disclosure for the link to G-Shock Mudmaster GWG-2000
Rank 3
Stock photoBest ABC display
G-Shock Mudman GW-9500
Duplex LCD draws the compass and pressure pointers; 81 g, 200 m.
EvidenceResearched · not worn by us
| Power class | Solar, no charger. A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
|---|---|
| Battery (cell) | Approximately 6 months with no light (Casio's stated usage conditions) |
| Power | Solar panel and one rechargeable battery |
| Glass | Mineral |
| Bezel & case | Carbon, resin and bio-based resin |
| Water rating | 200 meters; shock resistant; mud resistant |
| Sensors | Digital compass, altimeter, barometer, thermometer; sunrise/sunset times |
| Weight | 81 g |
| Size | 56.7 × 52.7 × 14.8 mm |
How the 8.2 score breaks down
- Battery & power independence (25%)
- 9
- Durability of materials (25%)
- 7
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 7
- Value per decade (10%)
- 9
- Mission fit (5%)
- 9
What the spec sheet supports
- 3.4 mm thinner and 12 g lighter than the Rangeman GW-9400 by the published figures.
- Mud-resistant buttons and a carbon-reinforced case.
- Sunrise/sunset and a barometer graph for reading weather in a stand.
Where it falls short
- Six months of stated dark-running versus the Rangeman's eight.
- Mineral crystal.
Skip this if…
…you want the longest-proven G-Shock module; the Rangeman has a decade more history behind it.
#ad · Price set by Amazon · Disclosure for the link to G-Shock Mudman GW-9500
Rank 4
Stock photoBest light ABC watch with radio time
Casio Pro Trek PRW-61
62 g, solar, five radio signals, ±10° / ±3 hPa; 100 m.
EvidenceResearched · not worn by us
| Power class | Solar, no charger. A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
|---|---|
| Battery (cell) | Approximately 6 months with no light (Casio's stated usage conditions) |
| Power | Solar panel and one rechargeable battery |
| Bezel & case | Biomass plastics case |
| Water rating | 100 m |
| Sensors | Direction, pressure/altitude and temperature sensors; radio time calibration (JJY, WWVB, MSF, DCF77, BPC); double LED light |
| Weight | 62 g |
| Size | 51.0 × 47.4 × 14.7 mm |
| Operating temp | Low-temperature resistance to -10°C (14°F) |
How the 8.1 score breaks down
- Battery & power independence (25%)
- 9
- Durability of materials (25%)
- 6
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 8
- Value per decade (10%)
- 9
- Mission fit (5%)
- 8
What the spec sheet supports
- Solar, atomic and triple sensor at 62 g and 14.7 mm.
- Cleaner dial and a proper altimeter graph for hikers.
Where it falls short
- 100 m and no mud-resistant buttons; it is a hiking watch, not a Mudman.
- Mineral glass.
Skip this if…
…your watch gets buried in mud or dunked regularly; the G-Shock Mudman is the sealed version of this idea.
#ad · Price set by Amazon · Disclosure for the link to Casio Pro Trek PRW-61
Rank 5
Stock photoBest budget ABC watch
Casio Pro Trek PRG-340
Triple Sensor v3, solar, 54 g, 100 m; no radio time.
EvidenceResearched · not worn by us
| Power class | Solar, no charger. A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
|---|---|
| Battery (cell) | Up to 7 months while used, up to 27 months in power save, with no light |
| Power | Tough Solar |
| Bezel & case | Biomass plastics |
| Water rating | 100 meters |
| Sensors | Triple Sensor Version 3: pressure (altimeter/barometer), compass, thermometer |
| Weight | 54 g (urethane band) |
| Size | 54.7 × 51.7 × 15.1 mm |
How the 8.0 score breaks down
- Battery & power independence (25%)
- 9
- Durability of materials (25%)
- 6
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 7
- Value per decade (10%)
- 10
- Mission fit (5%)
- 7
What the spec sheet supports
- Twenty-seven months in power-save mode is the longest stated figure of any Casio here.
- Lightest triple-sensor watch on the site at 54 g.
Where it falls short
- No Multi-Band 6; you set the time yourself.
- 100 m, mineral glass, no mud resistance.
Skip this if…
…you want the time to set itself; the PRW-61 adds radio calibration for the difference.
#ad · Price set by Amazon · Disclosure for the link to Casio Pro Trek PRG-340
Rank 6
Stock photoBest ABC watch for night vision
Suunto Core Alpha
Red NVG backlight, compass with declination, 12-month CR2032; 30 m.
EvidenceResearched · not worn by us
| Power class | Replaceable cell. A replaceable coin cell measured in years. No charging, no electronics to update, and the cheapest thing on the watch to service. |
|---|---|
| Battery (cell) | CR2032; up to 12 months of battery life in time mode |
| Glass | Mineral crystal |
| Bezel & case | Aluminum bezel; composite case; textile strap |
| Water rating | 30 m (suitable for shallow snorkeling to 10 m) |
| Sensors | Altimeter, barometer, compass with adjustable declination; night-vision-goggle-compatible red backlight |
| Weight | 67 g / 2.36 oz |
| Operating temp | -20°C to +60°C (-5°F to +140°F) |
How the 7.5 score breaks down
- Battery & power independence (25%)
- 8
- Durability of materials (25%)
- 5
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 8
- Value per decade (10%)
- 8
- Mission fit (5%)
- 9
What the spec sheet supports
- Red backlight built for NVG use, on a watch with no radio to go silent.
- A user-replaceable CR2032 and no charger, ever.
Where it falls short
- 30 m is the lowest water rating on the site; a G-Shock Rangeman is 200 m.
- Mineral crystal and a composite case.
Skip this if…
…your watch goes in the water for anything more than rain; the Rangeman does the ABC job at 200 m.
#ad · Price set by Amazon · Disclosure for the link to Suunto Core Alpha
Rank 7
Stock photoBest ABC watch with phone sync
G-Shock Mudmaster GG-B100
Quad sensor with step counter, Bluetooth, two-year coin cell, mineral crystal.
EvidenceResearched · not worn by us
| Power class | Replaceable cell. A replaceable coin cell measured in years. No charging, no electronics to update, and the cheapest thing on the watch to service. |
|---|---|
| Battery (cell) | CR2025, approx. 2 years |
| Glass | Mineral (spherical) |
| Bezel & case | Carbon Core Guard structure; carbon and resin |
| Water rating | 200 meters; shock resistant; mud resistant |
| Sensors | Quad sensor: compass, altimeter/barometer, thermometer, step counter; Bluetooth Mobile Link |
| Weight | 92 g |
| Size | 55.4 × 51.3 × 19.4 mm |
How the 7.5 score breaks down
- Battery & power independence (25%)
- 7
- Durability of materials (25%)
- 7
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 7
- Value per decade (10%)
- 8
- Mission fit (5%)
- 7
What the spec sheet supports
- A coin cell any watchmaker can swap; nothing to charge and nothing to update.
- Phone sync sets the time and pulls sensor logs into the app.
Where it falls short
- No solar and no radio time; the phone does the time-setting instead.
- 19.4 mm thick.
Skip this if…
…you never want a phone involved; the Rangeman sets itself from the air.
#ad · Price set by Amazon · Disclosure for the link to G-Shock Mudmaster GG-B100
How we scored this
Watches we claim to have worn or tested: 0
Plenty of sites say they took every watch up a mountain. We didn't, and we say so. What we do instead: read the maker's own battery table mode by mode, check what the lens and case are actually made of, note the water rating and whether a MIL-STD-810 claim exists, ask how long the maker keeps updating the line, and score every pick on a public rubric weighted for a decade of ownership. Every figure links to where it came from.
Scores are editorial judgments from that documented research, not test results. Commissions never set a score or decide a pick. The rubric and its weights are published.
Questions
Frequently asked
What is the best ABC watch?
The G-Shock Rangeman GW-9400: Casio publishes ±10° compass and ±3 hPa pressure accuracy for it, plus sunrise/sunset, Tough Solar, radio time, 200 m and mud seals. The Pro Trek PRW-61 is the same sensors at 62 g.
Do ABC watches have GPS?
No. That is the definition: altimeter, barometer and compass with no receiver, which is why they run for months or years on light or a coin cell.
Which ABC watch has the best battery?
The Tough Solar Casios never need a charger; Casio rates the Rangeman about 8 months and the PRG-340 up to 27 months in power save with no light. The Suunto Core Alpha runs up to 12 months on a replaceable CR2032.
Keep reading
Related on Bezel & Bearing
Receipts
Sources
- Casio — Operation Guide, module 3410 (GW-9400 Rangeman), Specifications (checked 2026-09-20)
- Pilot Mall — Casio G-Shock Rangeman GW9400-1 listing (case size, weight, water rating) (checked 2026-09-20)
- Casio — Operation Guide, module 5678 (GWG-2000 Mudmaster), Specifications (checked 2026-09-20)
- G-Central — G-Shock GWG-2000 Mudmaster spec sheet (checked 2026-09-20)
- Casio — Operation Guide, module 3553 (GW-9500 Mudman), Specifications (checked 2026-09-20)
- G-Central — G-Shock GW-9500 Mudman spec sheet (checked 2026-09-20)
- Casio — Operation Guide, module 5673 (Pro Trek PRW-61), Specifications (checked 2026-09-20)
- New Atlas — Casio Pro Trek PRW-61 announcement (size, weight, water rating, battery) (checked 2026-09-20)
- G-Central — Pro Trek PRG-340 announcement (size, weight, water rating, battery) (checked 2026-09-20)
- G-Central — G-Shock GG-B100 Mudmaster spec sheet (checked 2026-09-20)
- Suunto — Core Alpha Stealth product page and tech specs (checked 2026-09-20)
We don't own or wear-test these watches and we don't pretend to. Battery, glass, case and water figures come from the maker's own owner's manuals, spec pages and press releases (linked on every product), and where a figure isn't published we say so. Prices are set by Amazon and change often, so we don't print them. Read the full method.