COROS PACE 3, Reviewed Overnight

COROS PACE 3, Reviewed Overnight

An ultra watch lives or dies on one number, and it is not accuracy. It is battery. A GPS watch that dies at mile 50 is a bracelet, and the whole point of wearing one through a 100K or a 100-miler is that it is still recording — pace, distance, vert, time of day — when you cross the mat in the dark sixteen hours later. Judged on that single axis, the COROS PACE 3 is the most watch you can strap on for the money. Here is the battery-first case, built from its published specs and the consensus of the ultra runners who race it.

The Battery Numbers That Matter

COROS rates the PACE 3 in four modes, and the spread is the whole story:

• Standard full GPS: 38 hours. GPS-only tracking. This is the setting that outlasts almost any single-push race a first-timer or mid-packer will run.
• All systems on: 25 hours. All satellite constellations for better accuracy in trees and canyons. The default most people leave it on.
• All systems + dual frequency: 15 hours. The most accurate mode, using dual-band signals to cut error under heavy tree cover — and the biggest battery draw.
• Smartwatch mode: 24 days (about 18 with sleep tracking), and a full charge in roughly 1.5 hours.

Map those onto real races. A 100K that takes you 14 to 18 hours? The 25-hour all-systems mode covers it with margin to spare, at full accuracy. A 20-plus-hour 100-miler? Drop to standard GPS and its 38 hours swallows the whole day and night without a thought. Even the power-hungry dual-frequency mode's 15 hours covers a sub-15-hour 100K — and if you are chasing dual-frequency accuracy on a 24-hour hundred, you can switch modes mid-race or top it up in ninety seconds at a crewed aid station, because it charges fast enough to gain hours during a foot-care stop.

For context on how thin this used to be: not long ago, battery like this meant a flagship watch at three times the price. The PACE 3 delivers ultra-grade endurance at roughly $229, which is the entire reason it shows up on so many start-line wrists.

Weight: 30 Grams You Forget

Battery usually costs weight, and this is where the PACE 3 quietly wins twice. At 30 grams on the nylon band, it is one of the lightest full-GPS watches made — lighter than most flagships by a wide margin. Twenty hours into a race, when your skin is raw everywhere a strap touches, 30 grams versus 50-plus is the difference between a watch you forget and one more thing rubbing. For a distance measured in hours on the body, weight is a comfort spec, and this is a featherweight.

Accuracy vs Battery: The Real Tradeoff

The honest tension in any GPS watch is that accuracy and battery pull against each other, and the PACE 3 hands you the dial instead of deciding for you. Dual-frequency mode is genuinely more accurate under tree cover and in canyons — meaningful on technical mountain courses — but it costs you more than half the battery. For most ultra days the smart play is all-systems mode, which the community consensus rates as plenty accurate for trail racing while leaving you 25 hours. Save dual-frequency for shorter, technical efforts where battery is not the constraint. The point is that one watch covers a fast 50K and an overnight hundred; you just move the setting.

The Screen and the Controls

The PACE 3 uses a 1.2-inch memory-in-pixel (MIP) display, not a bright AMOLED. That is a deliberate endurance choice: MIP screens sip power and, crucially, get more readable in direct sunlight, where AMOLED can wash out. Always-on, high-contrast, glanceable mid-stride at mile 40 — for racing, MIP over AMOLED is a feature, not a compromise, even if the watch looks less flashy on your wrist at the office.

Controls are a touchscreen plus a digital dial, and the dial is the part that matters on trail. Sweaty, gloved, or rain-soaked fingers do not drive a touchscreen well; a physical dial you can spin and press does. Scrolling data screens and confirming laps with the dial is the right call for real race conditions.

Where It Comes Up Short

A battery-first review owes you the limits, argued honestly:

• Navigation is breadcrumb, not full mapping. The PACE 3 follows a route you sync to it and shows a track to stay on, but it is not the zoomable, pannable topographic map you get on watches costing two or three times as much. For a well-marked race with pink flagging every quarter-mile, a breadcrumb is all you need; for unmarked exploring, it is not a mapping watch.
• MIP is not for people who want a vivid screen. If you want your watch to glow like a phone, this is not it. That is the same tradeoff that buys the battery, but it is a real preference.
• It is a running watch, not a rugged expedition tool. No titanium, no sapphire, a polymer build. It is light and durable enough for racing, not armored.

None of these is a battery objection, which is the point: on the axis that decides ultra watches, it has no real weakness at this price.

The Verdict

For a first ultra, or as the do-everything training and racing watch for anyone who is not specifically chasing full offline maps, the COROS PACE 3 is the easiest recommendation in the category. It out-batteries races that cost you a year of training, weighs nothing on a raw wrist at hour twenty, and reads better in the sun than screens twice its price — for around $229. Buy it, set it to all-systems for most races, drop to standard GPS for a hundred, and forget about it. If you want to check the current price, it is the finisher-gift watch that does not require a big-ticket budget.

One watch does not make a night section survivable on its own, though. Pair it with a real light — the watch tells you it is 2 a.m., a proper 600-lumen headlamp is what gets you through the miles after it. To see a battery like this put to work across a full race, follow a 100K aid station by aid station; it earns its place alongside the vest, belt, or handhelds you carry it with, and you can weigh it against the rest of the kit in our gear picks.