Polar pushed firmware 6.0.18 to six of its watches on September 30, and for once the changelog is worth reading. This is not a bug-fix release.
The six are the Vantage V3, Vantage M3, Grit X2 Pro, Grit X2, Ignite 3 and Street X. They span a wide range of price points, which is unusual for an update this substantial.
The theme is simple. Polar is making the watch itself a better place to look at your own data, instead of sending you to the phone app.
Seven-Day Graphs Everywhere
The headline change is trend graphs for a long list of metrics. On these watches you now get a seven-day graph for:
- Nightly Recharge
- ANS charge
- Sleep charge
- Nightly heart rate
- Nightly heart rate variability
- Nightly breathing rate
- Sleep duration
That covers most of what Polar's recovery model is built on. Seeing seven days of ANS charge on your wrist changes how you read a single bad night, because you can see whether you're looking at a dip or a direction.
Three more graphs follow the same pattern:
- Running Index: the seven most recent results, in the Weekly summary view
- Weight: the seven most recent measurements, in the Daily activity view
- ECG: the seven most recent test results, in the ECG test history view
That ECG line is where the six watches stop behaving identically. The graph appears on the four ECG-capable models, which is the Vantage V3, Vantage M3, Grit X2 and Grit X2 Pro. The Ignite 3 and Street X don't get it, because they don't have ECG hardware. It's the one place in the release where the feature list splits.
The LIGHT Button Becomes Whatever You Want
On the Vantage V3, Vantage M3, Grit X2 and Grit X2 Pro, the LIGHT button is now a Custom button. You pick what it does in normal use, and you can assign a different action for individual sports while you're training.
The Street X gets the same concept through its built-in flashlight, which is an obvious candidate for the shortcut.
Early user feedback suggests this is one of the first changes people notice. The redesigned pre-training screen is getting similar attention, particularly the clearer indication of which external heart rate sensor is connected. If you've ever started a run unsure whether your chest strap had paired, that's a real fix.
Polar also moved the sport profile settings onto the watch. You can now change them from the main Settings menu, from pre-training mode, or while a workout is paused. Previously that meant reaching for your phone mid-session.
The Menus Got a Refresh
The interface work is broader than one screen. Polar has updated the colours and the transition animations, moved settings around, and brought Timers directly into pre-training mode.
One item is notable for what it removes. Strava Live Segments no longer takes up its own prominent slot in the main menu, which declutters things for anyone who never used it.
The Heart Rate Change Nobody Led With
Buried in the release is an update to Polar's optical heart rate algorithm. Polar says it worked on reducing occasional heart rate dropouts during workouts, during sleep and during normal daily use, while also improving performance across different skin characteristics.
That's the most consequential line in the update for anyone who has watched their heart rate trace go flat mid-run, or spent a night where the watch recorded almost nothing. No firmware note is going to tell you how much better it is, so the honest position is that this needs a few weeks of user reports before anyone can say whether it worked.
The skin characteristics line is worth flagging too. Optical sensing performance varying by skin tone is a well-documented problem across the category, and vendors rarely mention it in release notes.
Smaller Additions
- An option to stop charging at 80%, switched on under battery settings, which keeps the lithium cell away from a permanent full charge
- More background options for digital watch faces
- Quicker weight entry from the pull-down settings menu
- An optional weight update reminder, useful if you feed regular measurements into Polar's training and calorie calculations
Two Early Install Reports, Neither a Pattern
Early installs have produced a couple of isolated issues. One Vantage V3 owner reported the watch resetting during installation before updating successfully after pairing again. One Grit X2 Pro owner reported the touchscreen becoming unresponsive after assigning the flashlight to the Custom button.
Both are single reports. That's nowhere near enough to suggest a pattern, and neither is a reason to hold off. But the Custom button interaction is worth watching, since it's a new feature and it's the one with a report attached.
Context: This Comes After a Long Gap
For Grit X2 Pro owners specifically, the previous major firmware release landed back in January. That's more than eight months without a substantial update, which makes 6.0.18 land differently on that model than on the newer ones.
The release also follows Polar's OS 5 update earlier this year, which brought dark maps, RPE grading and new widgets. Read together, the two updates tell a consistent story: Polar is spending its software budget on the watch interface rather than on the phone app.
Bottom Line
This is a bigger update than the version number suggests. Trend graphs on the wrist, a configurable hardware button, sport settings you can change mid-run and a battery health option are all things people actually asked for.
The optical heart rate algorithm change is the one with the most upside and the least evidence so far. That's the part to judge in a month, not on release day.
Sources: Polar's official 6.0.18 firmware update pages for the Vantage V3, Vantage M3, Grit X2 Pro, Grit X2, Ignite 3 and Street X, covering the seven-day trend graphs for Nightly Recharge, ANS charge, Sleep charge, nightly heart rate, nightly HRV, nightly breathing rate and sleep duration, plus the Running Index, weight and ECG graphs and their per-model availability; Polar's release notes on the LIGHT button becoming a Custom button with separate per-sport assignment, the redesigned pre-training screen, on-watch sport profile settings, the menu and animation refresh, Timers moving into pre-training mode, the Strava Live Segments menu change, the optical heart rate algorithm update, the 80 percent charge limit, additional watch face backgrounds and quicker weight entry; and reporting from Gadgets & Wearables on the September 30 release date, the six-model rollout, the Grit X2 Pro update gap and the two early installation reports.
