The Casio Pro Trek WSD-F20A is a smart outdoor watch designed for adventurers and outdoor enthusiasts. Running Google's Wear OS on a 1.32-inch color touchscreen, it combines smartwatch functionality with rugged outdoor performance in an indigo blue colorway that pairs naturally with jeans and outdoor apparel.

Built-in GPS with support for American GPS, Russian GLONASS, and Japanese QZSS satellite systems provides precise positioning. The watch supports offline map navigation using downloadable worldwide color maps via Mapbox, allowing reliable navigation without cellular connectivity. A dual-layer display includes a monochrome LCD time-mode layer for extended battery life when full color isn't needed.

The WSD-F20A is equipped with a comprehensive suite of outdoor sensors including an altimeter, barometer, compass, and activity tracker. It meets MIL-STD-810 military standards for environmental stress resistance including shock and vibration, and is water resistant to 50 meters. The case measures approximately 61.7mm × 57.7mm × 15.3mm and weighs approximately 90g with the wristband.

Compatible outdoor and fitness apps include ViewRanger for trekking, Hole19 for golf, Glassy Surf Report, Ski Tracks, MySwimPro, Fishbrain, and Zombies Run. The WSD-F20A features a resin buckle closure.