The Zeblaze Stratos is a rugged smartwatch with plenty of features for its budget launch price of US$79.99. Not only does the device support multiple GPS modes, over 120 exercise modes and SpO2 monitoring, but it also has a 1.32-inch display and 5 ATM water resistance. Zeblaze claims that the Stratos should last up to 25 days between charges, too.
https://www.notebookcheck.net/Zeblaze-Stratos-GPS-smartwatch-with-a-barometer-compass-GPS-and-5-ATM-water-resistance-starts-globally-for-US-79-99.553533.0.html