VERSION 1.3
-Added US Units. You can now use Inches of Mercury for pressure and Fahrenheit for the temperature.
-Added the In-App Purchase to allow 'My Location'. This will automatically work out the Pressure and Density Altitude based on your current location. (This needs internet connectivity to work)
-Small UI Updates

VERSION 1.2
This version is limited to working with feet for height, Degrees Celcius for temperature, and hPa or QNH for pressure.
ISA is based on:  hpa = 1013, temperature 15 degrees at sea level