The Suunto 9 Peak is a GPS-enabled smartwatch with a lightweight and hardy chassis. The device supports blood oxygen saturation measurements via a SpO2 sensor and has a large battery for up to 170 hours between charges with GPS enabled. The Suunto 9 Peak will be available from early next month.
https://www.notebookcheck.net/Suunto-presents-the-Suunto-9-Peak-an-ultra-thin-and-robust-smartwatch.541485.0.html