Xiaomi released a phone with dual frequency GNSS in 2018 (with the Broadcom BCM4775 chipset), and as far as I know most Android phones have had it since then, or maybe a bit later. If you want to see if your phone supports it, try GPSTest.
Garmin has recently released several watches with it as well, both their high end models and some more affordable ones. They also have an auto mode that switches it on or off depending on if the current environment needs it, to save power when you can have the same accuracy without it.
Personally, I find the accuracy and sensitivity of modern GNSS devices amazing. I remember when you had to wait maybe 10 minutes to acquire a fix, the accuracy was poor and maybe within 10 meters, and if you covered the receiver with clothing you would lose satellite fix. Now my phone gets a good position in a few seconds, I can see which side of the road I ran on, and even with my phone in my pocket I can often get a reasonably accurate track indoors.
Garmin has recently released several watches with it as well, both their high end models and some more affordable ones. They also have an auto mode that switches it on or off depending on if the current environment needs it, to save power when you can have the same accuracy without it.
Personally, I find the accuracy and sensitivity of modern GNSS devices amazing. I remember when you had to wait maybe 10 minutes to acquire a fix, the accuracy was poor and maybe within 10 meters, and if you covered the receiver with clothing you would lose satellite fix. Now my phone gets a good position in a few seconds, I can see which side of the road I ran on, and even with my phone in my pocket I can often get a reasonably accurate track indoors.
https://www.androidauthority.com/dual-frequency-gps-878169/
https://play.google.com/store/apps/details?id=com.android.gp...