Garmin Fenix 6S - Review

The Garmin Fenix 6s is the smallest sized fitness tracking watch with a 42mm case size. All the internals are shrunk into a package which suits those with smaller wrists.

Most popular with women due to this fact - this watch feels less cumbersome whilst wearing. In comparison to the largest model (6X), which due to its sheer bulk can be easier to scratch the display. The 6s feels less of a burden on the wrist. 

Garmin Fenix 6S key features:

  • 1.2-inch
  • 42mm case size
  • 240 x 240 pixel
  • 61g
  • Six data fields
  • 20mm strap
  • 9 days smartwatch
  • 25 hours GPS
  • 50 hours Max Battery tracking
  • Pulse Ox, altimeter, barometer, compass
  • Heart rate, VO2 Max
  • TOPO mapping

The Fenix 6S comes with a 42mm case size, as opposed to the 47mm of the standard Fenix 6, and 51mm for the Fenix 6X Sapphire.

That’s a massive downsizing in wrist real estate. It’s got a 1.2-inch transflective display with a 240 x 240 pixel resolution. It’s a lower pixel count than the larger watches, but the same general quality.

However, it’s extremely power efficient and always-on and this sacrifice in aesthetics enables some of the Fenix’s best features.

The Fenix 6S weighs 61g with the strap, lighter than a standard Fenix 6 which is 83g. A significant saving.

A nod to its more female-friendly aesthetics, there’s a thin colour coded bezel which offers a bit more class than the standard Fenix. 

You get a serious amount of sensor tech built into the Fenix 6S. Including, 

Optical heart rate is a given, but it also features the Pulse Ox sensor, which can track blood oxygen. This really comes into its own for sleep data, which will show respiration when you’re in bed. You need to turn this on as it will affect battery life.

There’s an altimeter, barometer and compass, which will offer elevation and climbing data during a host of activities including skiing, climbing and hiking.

When ascending this will enable the ClimbPro feature which will show you the details including distance, time and heart rate. You can also pre-load climbs and ascents to pre-plan them.


Sports tracking

While the Garmin Fenix 6S has shrunk in size, the amount of sports tracked hasn’t.

And unlike options like the Vivoactive 4 which has a large sports tracking selection, it’s the detail you get and level of analytics which makes the Fenix 6 the best.

You get running (trail, indoor, outdoor, treadmill), biking (indoor, outdoor, MTB), pool and open swimming, climbing, skiing and snowboarding of all types, triathlon, strength, SUP, rowing, kayaking, golf, hiking, yoga and even more via the Connect IQ platform of apps.

And the analytics is insane. Running offers top notch dynamics and VO2 Max analysis, including Training Effect, Training Status, HRV, stress, Body Battery, recovery and even recommendations on the types of workouts missing in your weekly plan.

This is some of our favourite data, and a huge reason to invest in the Fenix 6. As runners we’re addicted to the Training Effect and Training Status data, which is a great way too evaluate sessions.

The Stress Score and Body Battery have also proved useful in assessing readiness for training – and in some quite hectic periods of training sessions have proved fairly accurate in highlighting fatigue.

You can get equivalent data from the Forerunner 945 - although that’s limited to the key triathlon sports. You will also find many of the VO2 Max and recovery stats on the Forerunner 245 and 645 – but again, not the full gamut.

The VO2 Max data you find on Fenix 6 watches comes from Firstbeat and they’re one of the best in the business in tapping into heart rate variability data and crunching the numbers to analyse recovery and training effect.

It’s important to note, however, that VO2 Max and all the lovely data that’s produced from it is very much based around running. You won’t get the same insights from hiking, or even busting big functional fitness or CrossFit workouts in the gym. It has to be an outdoor run with GPS, so if you’re not a runner, you’re going to be missing out on a lot of this juicy data.


Fenix 6S running and trekking

There’s no difference in the running tracking – or any sports from that matter – from the main Fenix 6. It’s one of the best running watches on the market. You can have up to six pages of data to cycle through - all set up from the watch itself.

Datas includes pace, distance time information. – but also lap data, cadence, heart rate, zones and more. It’s a top running experience, but no different from top-end Forerunners as we’ve already mentioned.

We found GPS accuracy to be top notch across a range of tests and certified races.

The Fenix 6S also has the PacePro feature found on the other Fenix 6 watches – and now on lower devices like the Forerunner 945 and even 245. This enables you to pace runs based on GPS data you download from the Garmin Connect app, even taking into account split times on hills. It’s not a perfect system.

When trekking you also get the TOPO maps and the compass, to help navigate when you're out in the wild. More on those below. You can also swap between power modes mid-hike, so if you're getting low on battery you can put it into the gentler UltraTrac mode.

Fenix 6S mapping


The Fenix 6S also features the same TOPO mapping – and while it's a nice feature to have, we still have reservations about its usefulness and usability.

In most workouts (running, trekking etc) you can cycle through the menus to a map screen. You can see what's around you, road, landmarks and more. There's also a feature that shows points of interest.

The mapping isn't really at a level of detail you need for proper trekking and shows nothing in the way of contours of the land – or anything short of major trails. A lot of the time you just see yourself in white space – although the compass works to show your heading, which can be useful if you go off piste.

Landmarks are quite neat, and you can pan/zoom using the buttons, although this really is quite a faff and the small screen means that by the time you've zoomed out to see something (anything) useful, it's too small to work with.

The feature does get more useful if you add GPX data to follow waypoints on a run or hike, and the extra data from the TOPO helps put your run in context with placements of rivers, woods and the like. It's not really good enough to go navigating your way around the wilderness without a proper map, however.


Fenix 6S battery life


The Fenix 6S’s reduced case size does lead to one major difference over its bigger brothers – battery life. There is quite a large pay-off in terms of longevity from opting for the 42mm device.

The quoted battery life is 9 days as a smartwatch – with up to 25 hours of GPS tracking. That’s down from 14 days and 36 hours from a 47mm Garmin Fenix 6.

One of the big differences in the Garmin Fenix 6 over the Fenix 5 is power management, and this has been streamlined.

Max Battery mode (the new name for Garmin UltraTrac) ups tracking to 50 hours on the Fenix 6S, but reduces GPS accuracy and should only be used for long hikes or ultra marathon distances. It will also disable the heart rate monitor.

Jacket mode keeps everything live but turns off heart rate and is good for winter sports where you might have the watch over the top of your coat. It tends to offer around 10% extra battery life.

You can access these power modes by starting an activity and bringing up the menu by pressing and holding the UP MENU button at 9 o’clock. If you choose Power Mode you can choose Normal, Max Battery and Jacket Mode – and get an estimate of the GPS time you’ll get within that mode.

If you’re not pushing the limits of endurance then we believe the Fenix 6S more than makes up for the battery life sacrifice with its reduced bulk. It’s much more wearable, and will suit more wrists.

Fenix 6S vs 6S Pro

There are some extra features of the Fenix 6S that you’ll only unlock if you opt for the Fenix 6S Pro version.

The main one is music playback. You get room for a whopping 2000 songs, including support for offline synced Spotify playlists (if you have a Premium account). Deezer and iHeartRadio is also supported.

It’s fairly easy to use and navigate, and good if you want to leave your phone at home. GPS and music battery life sits at 6 hours - which is the shortest in the range.

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