A rugged, water-resistant wristwatch that includes features such as an alarm, stopwatch, compass, heart rate monitor, tachymeter (rotating bezel for calculating speed), thermometer and tide indicator (for divers). For decades, analog and digital sports watches have been available; however, they have evolved into computer-based smartwatches that offer similar features along with apps that log the wearer's activities and offer personal health-related information. See
fitness tracker.