Garmin Instinct 3 AMOLED 45mm review

I haven't worn the Instinct 3 AMOLED. I'm working from DC Rainmaker's in-depth review of the series, published January 30, 2025, and from Garmin's own pages. The 7.2 is my opinion of those.

The price: $349.99Not verifiedNot verified at Garmin's US store (November 12, 2026).

The short version

This is Garmin's rugged watch with a color AMOLED screen. You pay for the screen in battery. Away from a charger for days? Look at the Solar edition first.

What the screen costs you in battery

DC Rainmaker's GPS-only figures for a 12-hour hike put the AMOLED edition at 41 hours and the Solar at 75. A second set, in his road ride section, gives 58 hours for the AMOLED and more than 300 for the Solar. The part of his review I worked from doesn't tie those numbers to a case size, so I'm reading them as AMOLED-edition figures in general.

That's the Solar running about 1.8 times as long in the first set, and more than 5 times in the second. This is the part that bugs me. A rugged watch you have to charge like a phone isn't much of a rugged watch.

In trip terms, 41 hours is three 12-hour hiking days with GPS on and a few hours to spare. Fine for a long weekend. Not for a week in the backcountry.

What you get for the trade

The screen, mainly. DC Rainmaker calls it "colorful and brilliant" in brightness and color. He gives no brightness figure, so that's his eye, not a meter.

Heart rate is the better news. On an interval run he found the readings essentially identical to the Polar and Apple sensors he compared them with. That result matters more to me than the screen does.

Garmin rates the series for water to 100 meters.

Which Instinct 3 I'd pick

The series, per DC Rainmaker, comes in these sizes and versions:

• Instinct 3 AMOLED, 45 mm (this one) and 50 mm
• Instinct 3 Solar, 45 mm and 50 mm
• Instinct E, 40 mm and 45 mm

I'd buy this 45 mm AMOLED if you run or ride near home, charge every week anyway, and want a screen you can read at a glance. I'd skip it for thru-hikes, expeditions or anything where the next plug is days away. That's the Solar's job, and DC Rainmaker's numbers make the gap hard to argue with.

Before you pay $349.99Not verifiedNot verified, check the 45 mm Solar on Garmin's site. If it costs the same or less, I'd take the GPS hours over the color.

Its age

DC Rainmaker wrote on January 30, 2025 that the watch had been on sale for about 3 weeks. By November 2026 it's nearly two years old. I'd only buy a two-year-old Garmin at a price that shows it.