Garmin watches might fit your requirements.

I've been a Garmin user for 14 years and I wish someone would take the GPS, heart rate, and IMU sensors out of my Fenix and put it in an open-source product.

But GPS is really hard to get right, especially if you want weeks of battery life.

Garmin have been a decent company (in the ethical/moral sense) to be a customer of for many years, but I think they're slowly losing that reputation. Yes, my 2018 hardware still does everything it did in 2018, no, I don't pay for or currently have a need for Connect+, but they're running out of hardware optimization opportunities to push people to new devices, and appear to be seeking alternative ways to maintain growth.

	▲	justapassenger an hour ago \| parent [-]
		Watches are now roughly in the same spot as phones - form factory is largely complete and each new version is a small iteration over previous generation, with changes that most people don’t care about. That being said - feature I LOVE added recently-ish that made really happy I’ve upgraded my many years old garmin was a flashlight (proper one, not screen brightness). It seemed like a gimmick but it’s now one of most used features on my watch - walking dog at night, looking for kids toys under the bed, fixing things around the house, looking for things in the bag, etc.