Enduro 4 Garmin's 320-hour solar watch gets faster maps, not a redesign

What is new about the Garmin Enduro 4?

Garmin announced the Enduro 4 on 6 October 2026 and calls it its longest-lasting GPS smartwatch with solar charging. Tech Advisor reports a UK price of £799.99, up from £769.99 for the Enduro 3, while the US price stays at $899.99. The design is, as T3 puts it, remarkably similar to the previous model, and the battery figures have not moved. The changes are mostly under the glass.

• More memory: 50% more RAM than the Enduro 3, which Garmin says gives 30% faster map panning, and storage doubles to 64 GB for maps and music.
• Better maps: built-in routable maps gain a new perspective view that shows more detail close up and further ahead.
• New training tools: grade-adjusted pace targets and a grade-adjusted rolling pace for hilly routes, plus stamina zones and a stamina curve built from your fitness and training history.
• Power modes: Max Accuracy for shorter efforts and Max Battery for very long ones.
• Smaller extras: Garmin Epic groups multiday trips into one story in Garmin Connect, indoor rowing adds VO2 max and a power curve, and rucking lets you change pack weight mid-activity.

How big is it, and how will it wear?

The case is 51 mm across, which is large, but Garmin quotes just 66 g for the whole watch. That low weight comes from a fibre-reinforced polymer case with a titanium bezel, rather than a full metal case, and from the ComfortFit fabric band, which Garmin describes as moisture-wicking and now uses its QuickFit system for quick swaps.

Garmin's launch material does not give a thickness or lug to lug figure, so we cannot say exactly how it compares with a Fenix on the wrist. As a rough guide, a 51 mm sports watch is happiest on wrists of around 17 cm and up.

How long does the battery last?

This is the reason to buy an Enduro. Garmin quotes up to 320 hours of GPS activity in the extended battery setting, and up to 90 days as a smartwatch. Both figures assume solar charging under Garmin's test conditions: 50,000 lux, and for the smartwatch figure, three hours a day outdoors. In a British winter you will see less from the solar panel, so treat those as best cases rather than promises. Even so, they are the same headline numbers as the Enduro 3, which already sat at the top of Garmin's range for endurance.

How well is it built?

• Display: a 1.4-inch memory-in-pixel screen with a solar lens. MIP is easy to read in sunlight and frugal with power, but less vivid than the AMOLED screens on Garmin's Fenix and Epix models.
• Lens: Power Sapphire, Garmin's scratch-resistant sapphire lens, with solar charging built in.
• Water resistance: 10 ATM, so swimming and open-water sessions are fine.
• Torch: an integrated LED flashlight with white and red modes.
• Colourway: dark olive, with a matching dark olive fabric band.

Is it good value against its rivals?

At £799.99 the Enduro 4 is a specialist's watch. Two outdoor rivals already on WhichWatch cost roughly half as much: the Coros APEX 4 46 mm at a £429 RRP and the Suunto Race 3S at £435. Both are capable multisport GPS watches, and for many runners and hikers they will be plenty.

The Enduro 4 earns its premium only if battery life is the thing you care about most. For ultra runners, multiday hikers and anyone who hates charging, weeks between top-ups and 320 GPS hours are worth paying for. For everyone else, the extra money buys endurance you may never use.

It is also worth checking Enduro 3 prices. T3 and Tech Advisor both report that the battery figures are unchanged, so if a retailer discounts the older model, the gap in day-to-day use is smaller than the price gap.

What is the catch?

The Enduro 4 is an evolution, not a redesign, and UK buyers pay £30 more than the Enduro 3's £769.99. The MIP display looks plain next to AMOLED rivals. And owners of the Enduro 3 have reported software niggles, from limited watch face options to bugs they hoped firmware updates would fix, so the new hardware is only as good as Garmin's software support. It is too new for much owner feedback of its own yet.

“The Enduro 4 is for people who measure a watch in weeks between charges, not features per pound.”

What do owners say?

Themes from public owner feedback, paraphrased. We never copy Amazon reviews or ratings.

• Owners of the previous Enduro 3 praise the hardware, faster satellite lock and map redraws, and reliable navigation on long off-trail hikes.

  Garmin Forums (opens in a new tab)

• Enduro 3 owners also flag fewer watch face and widget options than the Fenix range, plus software bugs that left some feeling like beta testers.

  Garmin Forums (opens in a new tab)