Uses the internal barometer of the iPhone 6 or iPhone 6 Plus to show very accurate and instantaneous vertical speed changes - No external devices needed! Not like pervious apps that require outside input from expensive 3rd party products, this uses the built in and very accurate barometer in the latest iPhone to provide:

- Pressure altitude (Check your transponder output)
- Station (Raw) pressure
- Vertical speed shown on the VSI gauge

Important Note:

This app is primarily built for the iPhone 6 and 6 Plus with their built in pressure sensor. It will work on older devices, however, accuracy will be limited, as the GPS is used for VSI data - flight testing shows much greater accuracy with the built in pressure sensor.