Smart Altimeter

*** NOTE: Your device (handheld or wearable) must have a built-in pressure sensor (preferred) or GPS (solely as a fallback if barometer is missing). With this app, the wearable will *not* poll GPS data from the paired phone. Android Wear watches equipped with a pressure sensor include Nixon Mission (165Hz sample rate), LG G Watch R (90Hz), LG Watch Sport (10Hz), LG Watch Urbane, and Huawei Watch (20Hz); with a GPS only, Moto 360 Sport and Sony Smartwatch 3. ***
Smart Altimeter uses pressure sensor on your device to measure your altitude above sea level or previously chosen reference altitude (if your device does not have a barometer, the app will fall back to GPS). Advanced multiple-layer algorithms are used to smooth noisy measurements and to calculate descent rate. The app can also speak your current altitude.
Use of devices with high-speed barometric sensors (60Hz or faster) is highly recommended for the feedback lag not to exceed 0.2s (the lag is 12 samples).