Amazfit T-Rex 3 update adds Helio Strap controls and smarter navigation

Amazfit is rolling out firmware version 6.3.13.5 for the T-Rex 3, adding tighter Helio Strap integration, better navigation and a number of map improvements. The 22.92MB update also tweaks VO2 Max estimates, Track Run and freediving alerts. The same update seems to be rolling out for T-Rex 3 Pro and Ultra 2.

Better Helio Strap integration

For starters, the company has improved the way the T-Rex 3 works with the Helio Strap and Helio Strap Pro. Once connected, several functions can now be controlled directly from the watch rather than through the Zepp app.

Users can access these controls through Control Center, shortcut cards or the device app on the watch. Options include low-battery alerts, Find Device and the ability to switch heart rate broadcasting on or off.

The Helio device needs to be running the latest firmware before the new controls will appear. This builds on the existing option to use the Amazfit Helio Strap as an external heart rate monitor.

There is also a new Accessory Reminder setting for workouts. When enabled, the T-Rex 3 searches for compatible accessories when you reach the workout GO screen, giving you the option to connect them or continue without pairing anything.

Navigation and maps get an upgrade

Route navigation gets two changes. The watch can now detect when you are travelling in the wrong direction and display an alert with a one-tap option to reverse the navigation direction. The T-Rex 3 will also notify you when it has successfully recalculated a route after you go off course.

Maps have received a larger batch of changes. Zepp Health says contour lines are now easier to see, while trails use a different colour so they stand out more clearly from urban roads.

Sidewalk information has also been added alongside some major roads. This appears at map scales between 200 metres and 8 metres, so it should become most useful as you zoom further into an area.

The way points of interest appear has been adjusted as well. Road names and place names should also display more clearly at different zoom levels, while users can now download maps covering a larger geographic area.

VO2 Max and workout tweaks

Zepp Health has also updated the VO2 Max algorithm. The company says the change improves accuracy and stability, although the changelog does not explain what has actually changed in the calculation.

Track Run gets a small adjustment for people using imperial units. The second workout page can now display both imperial and metric distance information, rather than sticking entirely to one measurement system.

Freediving also gets a minor change. Users can now select different buzzer types for depth and time alerts, making it easier to distinguish between the two underwater.