I hate those watches with direct USB ports, I prefer those magnetic connectors via USB-C. Can also charge them in the bus, if needed. You get such watches from Ali for ~20€, with all the sensors. With gadgetbridge.org you got a proper Software app without phoning home to China, only to the NSA via Google. My favorite is still the Huawei/Honor Smart Watch 2, but the GT5 comes close. Still have to try the HarmonyOS watches, which should be better than Android. And a GPS routing connector to Google Maps