A beautiful altimeter with great technology under the hood.LITE version features :- Works outdoor, in a vehicle or close to a window- Beautiful retina graphics- Feet or metersFULL version ADDITIONAL features :- GPS combined with NASA topographic data for better performance- Instant start (with data connexion)- Works indoor (with data connexion)- No adsCommon question : if the app always reports 0ft, go to settings > localization services and check if localization services and altimeter HQ are ON.