G-Shock Rangeman GW-9400 review: the buy-it-for-life ABC watch, line by line from Casio's guide

Verdict and score

What it is built for

Being on a wrist for years without asking for anything. The Rangeman is a triple-sensor G-Shock that charges from light, sets its own time from a radio signal, and seals its buttons against mud. It has no Bluetooth, no GPS and no firmware to update, which for the buyer this site is written for is a feature list, not a gap. The military and hunting rankings both put it first for those reasons.

Power: what Casio's guide says

"Solar panel and one rechargeable battery." "Approximate battery operating time: 8 months (from full charge to Level 4)" under listed conditions: light 1.5 seconds a day, beeper 10 seconds a day, direction readings 20 times a month, one climb a month, barometric pressure indicator readings about 24 hours a month, time calibration signal receive 4 minutes a day, display 18 hours a day. Casio adds that frequent use of illumination runs down the battery and that the auto light switch needs particular care. Read that as: in a drawer it runs eight months; on a wrist in daylight it runs indefinitely; on a wrist under a sleeve with the auto-light on, somewhere between. The cell is a watchmaker-replaceable part when it finally tires, per our battery replacement guide.

Sensors, sunrise and the 40-record memory

From the guide: altimeter measurement range -700 to 10,000 m with a reference-altitude setting and an altitude differential graph; barometer 260 to 1,100 hPa with readings every two hours and a pressure-change indicator; thermometer -10 to 60°C; digital compass with 16 directions, 60-second continuous reading, two-point calibration, magnetic declination correction and bearing memory. Direction accuracy within ±10°, pressure within ±3 hPa (altimeter within ±75 m), temperature within ±2°C. Up to 40 records shared across altitude, bearing, pressure and temperature. Sunrise/sunset time display with a selectable date. Multi-Band 6 receiving from six transmitters in the US, UK, Germany, Japan and China. Five alarms, world time for 48 cities, a 1/100-second stopwatch and a 24-hour countdown.

Durability and what fails first

Two hundred meters, shock resistant, mud resistant, low-temperature resistant to -10°C, a mineral crystal behind a raised bezel, a resin case and strap, 55.2 × 53.5 × 18.2 mm, 93 g. The retail listing supplies the physical figures because Casio's own product pages block automated readers; the guide supplies the module figures. The case is thick and the bezel deep, which is why old Rangemen still read cleanly.

Daily wear

It is big: 18.2 mm thick and 93 g. Under a jacket cuff it is a presence, not a watch. The LED light with selectable 1.5 or 3 second duration and an auto-light switch that only fires in the dark are Casio's wording; turn the auto-light off in a treestand. The display has two formats (day of week, or a barometric pressure graph on the home screen) and the button operation tone can be switched off, which matters in a blind.

Who should skip it

Anyone who wants a track: the Instinct 3 Solar, or the GPR-H1000 if the case matters more than the hours. Anyone with a small wrist: the Mudman GW-9500 is the same feature list slimmer. Anyone who wants sapphire: the Mudmaster GWG-2000. Everyone else: this is the watch.