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Altitude measuring instrument is a necessary APP for outdoor travel and reaching people. It has powerful and accurate GPS positioning function. It allows you to get the information of current position, such as altitude, GPS position, air pressure, longitude and latitude coordinates in real time at the fastest speed. It also has built-in compass function. It will be a necessary real-time altitude measuring application for outdoor activities. For example: hiking, walking, skiing, rock climbing, mountain biking, hiking, mountain climbing, weather, compass, camping, outdoor, backpack, flight altitude and so on. 【Characteristic function】 1. Altitude meter: real-time altitude measurement, without network can accurately measure the location of altitude and longitude and latitude; 2. Compass: The built-in compass function allows you to get the direction and latitude information of your location more quickly. 3. Map navigation: support to view the map function, coordinates and elevation information of the current location and display on the map; 4. GPS positioning: GPS real-time positioning, making altitude measurement information faster and more accurate; 5. Watermarking camera: Watermarking photography is supported. The altitude, air pressure, longitude and latitude information of the photograph will be recorded by watermarking. 【Altitude subscription】 You can subscribe for access to the full list of Altitude PRO- with Compass. Payment will be charged to iTunes Account at confirmation of purchase. You can try all VIP benefits during the subscription period. Subscription automatically renews for the same price and duration period as the original "one month" package unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period at the cost of the monthly package Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's iTunes Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period. You may cancel a subscription during its free trial period via the subscription setting though your iTunes account. This must be done 24 hours before the end of the subscription period to avoid being charged. Please visit: http://support.apple.com/kb/ht4098 for more information. You may turn off the auto-renewal of your subscription via your iTunes Account Settings. However, you are not able to cancel the current subscription during its active period. Any unused portion of free-trial period, will be forfeited when the user purchases an app subscription. Links to our Terms of Service and Privacy Policy can be found below. Privacy Policy: http://didiapps.com/assets/agreement/altitude_privacypolicy_en.html Terms of Use: http://didiapps.com/assets/agreement/altitude_subscription_en.html