Featuring a midsize (47 mm) form factor with a silver titanium bezel and scratch-resistant domed sapphire crystal lens, the D2 Delta model is built for extra-rugged durability in demanding environments. With a rich array of color mapping, weather, waypoint reference and flight logging features, you can count on reliable on-wrist situational reference and backup navigation in your cockpit. Then, between flights, you can use the latest sport watch features — including Elevate™ wrist-based heart rate monitoring¹, daily activity tracking², training metrics and more — to keep up with your personal fitness goals. For these intense activities, each D2 Delta version comes with a soft, flexible black silicone sports band, offering easy QuickFit® band replacement without tools. And wherever you travel, smart notifications¹ (emails, text messages, alerts and more) can display on the watch to help you stay in the know while on the go.