Garmin D2 Air X15 Review: Aviation Watch for Endurance Athletes

The Garmin D2 Air X15 sits at $649.99 and pitches itself as a dual-purpose tool: aviation navigation for pilots and a capable sport watch for endurance athletes. It runs on the same Garmin platform you know from the Fenix 7 and Epix lines, so the training metrics, HRV tracking, and workout tools are genuinely solid.

The AMOLED display is a real win here. It punches as bright and sharp as the Garmin Epix Pro, which is saying something, and the 47mm case stays light enough that you won't hate wearing it on a long ride or run. The built-in flashlight is a practical touch for early morning trail sessions, and voice commands add a layer of convenience you don't get on a Coros Vertix 2S or a Polar Grit X2 Pro.

Flight logging and aviation navigation are the headline features, but most triathlon or trail runners will never touch them. What matters more is what's missing: no onboard topographic maps, which puts it behind the Fenix 7X Pro and even the Coros Vertix 2S at a similar price point. The Garmin D2 Mach 2 also keeps a few exclusives that the X15 doesn't get, so pure aviators might feel the gap.

For the endurance athlete who also flies, or just wants a premium AMOLED Garmin with a unique look, the X15 delivers real value. For everyone else, a Fenix 7 Pro or Epix Pro at comparable pricing gives you maps and skips the cockpit overhead. Not perfect. But if the brief fits, it's a sharp piece of kit.